WHAT'S INSIDE: HUMAN BODY

The human body is an amazing structure made up of many fascinating parts and systems. Learn about the human body and how its systems work together.
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  • Body Systems
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How much do you know about the human body?
FPO

During early pregnancy, both male and female human embryos develop something called milk lines, ridges that eventually recede into nipples. Why have some species lost this unisex trait, and can human men actually produce milk?

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Anatomy 101: Human Body Quiz

You remember a little ditty about the thigh bone being connected to the hip bone, which was in turn connected to the backbone. But what else do you remember about human anatomy? The answers to this quiz are all inside of you -- literally.

Heart Videos

The heart muscle is required to keep a steady beat. Learn all about the heart and how it functions in these videos on HowStuffWorks.

HEALTH: HUMAN BODY
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