Human Cells Explained
Meet the ~37 trillion cells that build you: what is inside a cell, how cells make energy, and why they are the starting…
4.6
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Anatomy Category
Foundations of the Body
Start here. The building blocks of life — cells, DNA, tissues and how a single fertilised cell becomes a whole human being.
Guides
Guides in Foundations of the Body
Start with any guide below — each one is written for beginners and builds on the last.
DNA Basics for Beginners
DNA is the instruction manual inside almost every cell. Learn what genes are, how the double helix stores information…
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Human Growth and Development
From a single cell to adulthood — the stages of human growth, what drives them, and why children are not just small…
4.6
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Common Human Body Myths, Debunked
Do we only use 10% of our brains? Does cracking knuckles cause arthritis? Sorting durable myths from the evidence, one…
4.8
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Amazing Human Body Facts
Your blood vessels could wrap the planet twice; your gut has its own nervous system. A tour of the body's most…
4.9
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The Complete Beginner's Guide to Anatomy
New to the human body? Start here. A guided tour through every major system, the vocabulary you need, and a roadmap for…
4.8
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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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Quiz
Anatomy Quiz
Test your knowledge of the human body with an adaptive multiple-choice quiz and instant, explained feedback.
4.9
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Reference
Medical Terminology Finder
Decode anatomy and physiology terms by their Greek and Latin roots, prefixes and suffixes.
4.7
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Related articles
Deeper dives and fascinating facts from the blog.
27 Amazing Human Body Facts That Sound Fake (But Are True)
Your body is stranger and more astonishing than fiction. Here are 27 verified facts about human biology, with the science behind…
DNA for Beginners: The Instruction Book of Life
What is DNA, what are genes, and how does a molecule store the plans for a whole human? A gentle, jargon-free introduction.
Cell Biology Basics: The Body's Building Blocks
Every part of you is built from cells. Look inside a cell, meet its main parts, and see how cells cooperate to make tissues.
Explore another body system
Every part of the body connects to the rest. Browse all nine categories and keep exploring.