Tap an area of the body, or just pick from the list. Areas with no shape of their own — the spine, the skeleton, the skin — are at the bottom of the list.
All 18 parts, head to toe
Checkmarks show what you've opened.
A part is a thing you could point to. A system is a team of parts spread all over the body that work on one job together. Your heart is a part; your circulatory system is the heart plus every vessel it feeds, head to toe.
Most parts belong to more than one team. The throat is on both the breathing team and the eating team, which is exactly why food goes down the wrong pipe.
Everything in one continuous read, head to toe. This page prints — use your browser's print command if you'd like it on paper.