About this quiz
The human body is the one science topic everybody has first-hand experience of. This quiz covers the skeleton, the main organs, the blood and the brain, using the facts taught in school biology: how many bones an adult has, which organ is the largest, what red blood cells do and why the body needs vitamin D.
Each explanation says what the part does, not just its name, so you come away with a picture of how the pieces fit together. The quiz is general education only. It is not medical advice, and anyone with a health question should ask a doctor or another qualified professional.
Body facts from the quiz
- A typical adult skeleton has 206 bones. Babies are born with more, and some of them fuse as the child grows.
- The stapes, a bone deep in the middle ear, is the smallest and lightest bone in the body, only two to three millimetres long.
- Skin is the largest organ, covering the whole body surface.
- Human cells normally carry 46 chromosomes, arranged as 23 pairs.
Frequently asked questions
Is this quiz medical advice?
No. It is general education for curious learners. For any health question, speak to a doctor or another qualified professional.
Why do some people have a different number of teeth or bones?
The figures in the quiz are typical for adults. People differ, for example when wisdom teeth never develop or are removed, or when bones fuse in unusual ways.
Where do the answers come from?
From standard anatomy and biology references. The size of the stapes was re-checked against a reference page on 8 November 2026.