THE LESSON LIBRARY / BIOLOGY

Biology, explored.

167 free learning pages. Pick a question and start exploring.

3D Human Atlas

Explore an adult male and an adult female reference anatomy and seven botany models in 3D. Isolate any structure, switch systems on and off, and read what each one is.

Explore lesson BiologyAnatomy lesson

Abdomen — 3D anatomy

The gut from stomach to large intestine, the solid organs beside it, and the great vessels behind. 17 named structures, each openable in an interactive 3D model.

Explore lesson BiologyAnatomy lesson

Abdominal aorta — 3D anatomy

Abdominal aorta in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Adrenal gland — 3D anatomy

Adrenal gland in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

Explore lesson BiologyAnatomy lesson

Ampulla of left uterine tube — 3D anatomy

Ampulla of left uterine tube in the Female Pelvis & Breast: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Anatomy | MBBS

Regional and systemic anatomy in 3D, structure by structure, with the NCERT chapter notes attached where they overlap.

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Anatomy of Flowering Plants

Link plant tissue structure to function and recognise dicot and monocot roots, stems and leaves in section.

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Animal Kingdom

Use symmetry, germ layers, body cavity and organ systems to recognise major animal phyla and vertebrate classes.

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Aorta — 3D anatomy

Aorta in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Appendix — 3D anatomy

Appendix in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Atlas — 3D anatomy

Atlas in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Axillary artery — 3D anatomy

Axillary artery in the Upper Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Axis — 3D anatomy

Axis in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Biodiversity and Conservation

Understand diversity at multiple levels, geographic patterns, extinction drivers and conservation strategies.

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Biological Classification

Compare the five-kingdom framework using cell type, organisation and nutrition, then distinguish viruses, viroids and lichens.

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Biomolecules

Explain carbohydrates, proteins, lipids and nucleic acids, then investigate how enzymes control reaction rates.

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Biotechnology and Its Applications

Explain engineered crops, recombinant medicines, molecular diagnosis, transgenic models and bioethics.

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Biotechnology: Principles and Processes

Build a recombinant-DNA workflow from molecular tools to amplification, host selection and product recovery.

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Body Fluids and Circulation

Compare blood and lymph, follow double circulation, and connect electrical conduction with the cardiac cycle and ECG.

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Body of uterus — 3D anatomy

Body of uterus in the Female Pelvis & Breast: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

Explore lesson BiologyAnatomy lesson

Brachial artery — 3D anatomy

Brachial artery in the Upper Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Brain — 3D anatomy

Brain in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Breathing and Exchange of Gases

Explain ventilation, alveolar diffusion, blood gas transport and respiratory regulation, using volumes and pressure changes.

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Calcaneus — 3D anatomy

Calcaneus in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Carpal bone — 3D anatomy

Carpal bone in the Upper Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Cecum — 3D anatomy

Cecum in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Cell Cycle and Cell Division

Track chromosomes and DNA through the cell cycle, mitosis and meiosis, explaining growth and genetic variation.

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Cell: The Unit of Life

Compare prokaryotic and eukaryotic cells and connect membranes, organelles and cellular structures with their functions.

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Cerebellum — 3D anatomy

Cerebellum in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Cervical vertebra — 3D anatomy

Cervical vertebra in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Chemical Coordination and Integration

Connect endocrine glands, hormone targets and feedback, comparing signalling mechanisms and major hormone imbalances.

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Classification explorer — Biology Lab

Compare organisms through the taxonomic ranks.

Explore lesson Biology3D atlas

Classroom Mode

Large-target 3D anatomy for an interactive smart board or projector.

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Clavicle — 3D anatomy

Clavicle in the Upper Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Common carotid artery — 3D anatomy

Common carotid artery in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Corpus callosum — 3D anatomy

Corpus callosum in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Data Sources & Licences

Where the anatomy datasets come from, what each contains, their licences, and what this platform cannot yet do.

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Diaphragm — 3D anatomy

Diaphragm in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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DNA & RNA pairing — Biology Lab

Build complementary strands and compare DNA with RNA.

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Double circulation — Biology Lab

Trace blood between the heart, lungs and body.

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Duodenum — 3D anatomy

Duodenum in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Ecosystem

Follow matter and energy through ecosystem components, production, decomposition and trophic pyramids.

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Embryology — 3D anatomy

Development from fertilisation onward, and the anomalies that follow from it. 0 named structures, each openable in an interactive 3D model.

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Energy pyramid — Biology Lab

Trace an illustrative ten-percent transfer through trophic levels.

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Enzyme kinetics — Biology Lab

Change substrate concentration and explore saturation.

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Esophagus — 3D anatomy

Esophagus in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Evolution

Explain the origin and diversification of life using evidence, natural selection and population genetics.

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Excretory Products and Their Elimination

Follow filtration, selective reabsorption and secretion through a nephron, then explain urine concentration and hormonal regulation.

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Female Pelvis & Breast — 3D anatomy

The female reproductive tract as one connected piece, and the mammary lobes and ducts. 10 named structures, each openable in an interactive 3D model.

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Femoral artery — 3D anatomy

Femoral artery in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Femur — 3D anatomy

Femur in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Fibula — 3D anatomy

Fibula in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Fimbria of left uterine tube — 3D anatomy

Fimbria of left uterine tube in the Female Pelvis & Breast: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Frontal bone — 3D anatomy

Frontal bone in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Fundus of uterus — 3D anatomy

Fundus of uterus in the Female Pelvis & Breast: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Gallbladder — 3D anatomy

Gallbladder in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

Explore lesson BiologyAnatomy lesson

General Anatomy — 3D anatomy

Terminology, planes, tissues and the general organisation of the body. 0 named structures, each openable in an interactive 3D model.

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Gluteus maximus — 3D anatomy

Gluteus maximus in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Gluteus medius — 3D anatomy

Gluteus medius in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Head & Neck — 3D anatomy

The bones of the skull, the cervical spine, and the structures of the neck. 16 named structures, each openable in an interactive 3D model.

Explore lesson BiologyAnatomy lesson

Heart — 3D anatomy

Heart in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Hip bone — 3D anatomy

Hip bone in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Hip bone — 3D anatomy

Hip bone in the Pelvis & Perineum: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Histology — 3D anatomy

The microscopic structure of tissues and organs. 0 named structures, each openable in an interactive 3D model.

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Human Health and Disease

Compare pathogens, immune responses, cancer and substance dependence; includes dengue and chikungunya syllabus supplements.

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Human Reproduction

Connect reproductive anatomy, gamete formation, menstrual regulation and early development.

Explore lesson BiologyAnatomy lesson

Humerus — 3D anatomy

Humerus in the Upper Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Hyoid bone — 3D anatomy

Hyoid bone in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Hypothalamus — 3D anatomy

Hypothalamus in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Ileum — 3D anatomy

Ileum in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Inferior vena cava — 3D anatomy

Inferior vena cava in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Interactive Biology Labs

Explore genetics, DNA, PCR, cell division, photosynthesis, physiology and ecology with thirteen interactive teaching models.

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Internal jugular vein — 3D anatomy

Internal jugular vein in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Jejunum — 3D anatomy

Jejunum in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Kalviyogi MBBS | Interactive 3D Human Anatomy & Medical Learning

Interactive 3D anatomy and medical learning platform for MBBS and NEET students. Explore anatomy in 3D, region by region, with NCERT Class XI and XII chapters mapped onto the…

Explore lesson BiologyAnatomy lesson

Kidney — 3D anatomy

Kidney in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Large intestine — 3D anatomy

Large intestine in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Left lung — 3D anatomy

Left lung in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Left ovary — 3D anatomy

Left ovary in the Female Pelvis & Breast: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Limiting factors — Biology Lab

Explore how light and carbon dioxide limit photosynthesis.

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Liver — 3D anatomy

Liver in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Locomotion and Movement

Connect skeletal-muscle structure with sliding-filament contraction, then compare the skeleton, joints and common movement disorders.

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Lower Limb — 3D anatomy

The hip, thigh, leg and foot, with the large muscles that move them. 14 named structures, each openable in an interactive 3D model.

Explore lesson BiologyAnatomy lesson

Main lactiferous duct — 3D anatomy

Main lactiferous duct in the Female Pelvis & Breast: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Mammary lobe — 3D anatomy

Mammary lobe in the Female Pelvis & Breast: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

Explore lesson BiologyAnatomy lesson

Mandible — 3D anatomy

Mandible in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Maxilla — 3D anatomy

Maxilla in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

Explore lesson BiologyLearning guide

MBBS Subjects

The four-year MBBS curriculum, with anatomy opening directly into the 3D atlas and every subject stating what content exists.

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Mechanics of breathing — Biology Lab

Connect diaphragm movement, pressure and airflow.

Explore lesson BiologyAnatomy lesson

Medulla oblongata — 3D anatomy

Medulla oblongata in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

Explore lesson BiologyAnatomy lesson

Metacarpal bone — 3D anatomy

Metacarpal bone in the Upper Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Microbes in Human Welfare

Connect microbial metabolism with food, industrial products, sewage treatment, biogas and sustainable agriculture.

Explore lesson BiologyAnatomy lesson

Midbrain — 3D anatomy

Midbrain in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Mitosis & meiosis — Biology Lab

Follow chromosomes through two kinds of cell division.

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Molecular Basis of Inheritance

Follow genetic information from DNA structure and experiments to replication, expression, regulation and genome analysis.

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Morphology of Flowering Plants

Recognise vegetative and floral organs, describe flowers precisely, and compare the five families listed in the NEET supplement.

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NEET Biology — English & Tamil Lessons

Learn all 32 NCERT Biology chapters with English and Tamil topic notes, interactive labs, original practice questions, revision and reading progress.

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NEET Biology 3D Models

Explore chapter-linked 3D models for all 32 Biology chapters: select structures, reveal layers and play process animations in the anatomy atlas viewer.

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Nerve impulse — Biology Lab

Step through ion movements in an action potential.

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Neural Control and Coordination

Follow signals from neurons to synapses and reflexes, then relate brain regions and sensory pathways to coordinated responses.

Explore lesson BiologyAnatomy lesson

Neuroanatomy — 3D anatomy

The brain, brainstem and spinal cord, and the way the parts sit against one another. 11 named structures, each openable in an interactive 3D model.

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Occipital bone — 3D anatomy

Occipital bone in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Optic nerve — 3D anatomy

Optic nerve in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Organisms and Populations

Relate population attributes and growth models to environmental limits and species interactions.

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Pancreas — 3D anatomy

Pancreas in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Parietal bone — 3D anatomy

Parietal bone in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Patella — 3D anatomy

Patella in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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PCR amplification — Biology Lab

Explore the three thermal stages and ideal doubling.

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Pelvis — 3D anatomy

Pelvis in the Pelvis & Perineum: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Pelvis & Perineum — 3D anatomy

The bony pelvis, the lower urinary tract and the pelvic organs. 9 named structures, each openable in an interactive 3D model.

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Photosynthesis in Higher Plants

Follow light energy into ATP and NADPH, trace carbon fixation, and compare C3, C4 and photorespiratory pathways.

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Physiology | MBBS

How the systems work. The atlas can show you where, and the chapter notes cover the mechanisms it cannot draw.

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Pituitary gland — 3D anatomy

Pituitary gland in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Plant Growth and Development

Describe growth phases and differentiation, compare growth regulators, and connect environmental signals with plant development.

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Plant Kingdom

Compare major plant groups through vascular tissue, spores, seeds and dependence on water, and trace their life cycles.

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Pons — 3D anatomy

Pons in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Population growth — Biology Lab

Compare exponential and logistic growth as resources change.

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Portal vein — 3D anatomy

Portal vein in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Principles of Inheritance and Variation

Use crosses, chromosomes and pedigrees to explain inheritance patterns, variation and genetic disorders.

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Prostate — 3D anatomy

Prostate in the Pelvis & Perineum: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Pulmonary artery — 3D anatomy

Pulmonary artery in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Punnett square — Biology Lab

Cross parental genotypes and calculate offspring probabilities.

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Radius — 3D anatomy

Radius in the Upper Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Rectum — 3D anatomy

Rectum in the Pelvis & Perineum: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Regional Anatomy in 3D

Thorax, abdomen, head and neck, neuroanatomy, upper and lower limb, and pelvis — each opening in an interactive 3D model.

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Renal artery — 3D anatomy

Renal artery in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Reproductive Health

Study reproductive-health education, contraception categories, infertility technologies and ethical safeguards for NEET.

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Respiration in Plants

Trace glucose breakdown through glycolysis, fermentation, the Krebs cycle and electron transport, comparing energy yields and substrates.

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Rib — 3D anatomy

Rib in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Right lung — 3D anatomy

Right lung in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Right ovary — 3D anatomy

Right ovary in the Female Pelvis & Breast: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Sacrum — 3D anatomy

Sacrum in the Pelvis & Perineum: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Sartorius — 3D anatomy

Sartorius in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Scapula — 3D anatomy

Scapula in the Upper Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Sexual Reproduction in Flowering Plants

Trace pollen and embryo-sac development through pollination, double fertilisation, seeds and fruits.

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Skull — 3D anatomy

Skull in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Soleus — 3D anatomy

Soleus in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Sphenoid bone — 3D anatomy

Sphenoid bone in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Spinal cord — 3D anatomy

Spinal cord in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Spleen — 3D anatomy

Spleen in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Sternocleidomastoid — 3D anatomy

Sternocleidomastoid in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Sternum — 3D anatomy

Sternum in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Stomach — 3D anatomy

Stomach in the Abdomen: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Structural Organisation in Animals

Study four animal tissue types and trace the frog’s organ systems, relating each structure to its function.

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Superior vena cava — 3D anatomy

Superior vena cava in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Talus — 3D anatomy

Talus in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Tarsal bone — 3D anatomy

Tarsal bone in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Temporal bone — 3D anatomy

Temporal bone in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Testis — 3D anatomy

Testis in the Pelvis & Perineum: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Thalamus — 3D anatomy

Thalamus in the Neuroanatomy: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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The Living World

Identify the properties of living systems, write scientific names, and move through the taxonomic hierarchy using evidence.

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Thoracic vertebra — 3D anatomy

Thoracic vertebra in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Thorax — 3D anatomy

The chest wall, the lungs and airways, and the heart with its great vessels. 13 named structures, each openable in an interactive 3D model.

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Thymus — 3D anatomy

Thymus in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Tibia — 3D anatomy

Tibia in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Tibialis anterior — 3D anatomy

Tibialis anterior in the Lower Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Tongue — 3D anatomy

Tongue in the Head & Neck: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Trachea — 3D anatomy

Trachea in the Thorax: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Ulna — 3D anatomy

Ulna in the Upper Limb: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Upper Limb — 3D anatomy

The shoulder girdle, arm, forearm and hand, with the arteries that supply them. 9 named structures, each openable in an interactive 3D model.

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Ureter — 3D anatomy

Ureter in the Pelvis & Perineum: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Urethra — 3D anatomy

Urethra in the Pelvis & Perineum: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Urinary bladder — 3D anatomy

Urinary bladder in the Pelvis & Perineum: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Urine formation — Biology Lab

Explore filtration, reabsorption and secretion.

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Uterine cervix — 3D anatomy

Uterine cervix in the Female Pelvis & Breast: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Vagina — 3D anatomy

Vagina in the Female Pelvis & Breast: what it is, where it sits, and an interactive 3D model you can rotate and isolate.

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Your saved study set

Return to saved Biology chapters, revision notes and 3D structures, with your reading progress. Kept in your browser only.

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