🫀 Human body 3D
🫀 Heart
A two-sided muscular pump: the right side sends blood to the lungs, the left side to the whole body.
- Size
- ≈ a closed fist, 250–350 g
- Beats
- ≈ 60–100 per minute at rest — about 100,000 a day
- Output
- ≈ 5 litres of blood a minute at rest
- Circulation
- Described by William Harvey, 1628