Skin Anatomy
Your largest organ is a waterproof, self-repairing barrier. The three layers of skin and the many jobs they do beyond…
4.7
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Anatomy Category
Senses & Skin
How you experience the world — sight, hearing, smell, taste and touch, plus the skin, hair and nails that protect you.
Guides
Guides in Senses & Skin
Start with any guide below — each one is written for beginners and builds on the last.
The Biology of Hair
Why hair grows, rests and sheds in cycles. What hair is made of, how colour happens, and why it grows faster in some…
4.6
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How Nails Grow
Nails are sheets of the same protein as hair. Where growth begins, why fingernails outpace toenails, and what nails…
4.6
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Eyes and Vision
How the eye turns light into images your brain can read. The lens, retina and the split-second processing behind…
4.9
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Ear Anatomy
Three regions, tiny bones and a spiral of fluid. How the ear captures sound and also keeps you balanced on two feet.
4.6
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How Hearing Works
From sound wave to signal in milliseconds. Follow a sound through the ear canal, eardrum and cochlea to the brain that…
4.6
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Smell and Taste
Two chemical senses that work as a team. How the nose and tongue detect molecules and why food seems flavourless when…
4.7
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Practice
Related tools
Reinforce what you learn with these interactive tools.
Reference
Anatomy Glossary
A searchable, plain-language glossary of the anatomy terms used across the site.
4.8
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Interactive
Body Systems Explorer
Browse all major body systems in one place and jump to the organs and guides for each.
4.6
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Quiz
Biology Revision Tool
Mixed-topic revision questions across all body systems, ideal for exam preparation.
4.9
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Read more
Related articles
Deeper dives and fascinating facts from the blog.
Eye Health Basics: How You See the World
Your eyes turn light into images in milliseconds. Learn how vision works and simple, evidence-based habits for eye comfort.
Ear Anatomy Explained: Hearing and Balance
The ear does two jobs at once: it hears and it keeps you balanced. A tour from the outer ear to the spiral cochlea.
Hair and Nails Explained: Growth, Cycles and Colour
Why hair grows and sheds in cycles, why nails keep growing, and what they are all made of.
Explore another body system
Every part of the body connects to the rest. Browse all nine categories and keep exploring.