The story for kids
Now we're inside our own blood, inside a blood vessel. Red cells are floating past you, carrying oxygen to the whole body. Listen to the heart. After every beat, the flow speeds up. And the big white cells are our protectors. They hunt germs.
Facts
- Blood flows through tubes called blood vessels.
- The heart pushes the blood: see how the flow speeds up with every beat.
- White blood cells are our defenders: they hunt germs.
Numbers
- The red blood cell
- ~0.007 mm
- Magnification
- ×2 000