a deep breath. Where does that air you breath in go?
That's right, into your lungs, but that's not the end! Your
heart pumps blood into your lungs and the blood mixes with the
oxygen you just breathed.
Click here to see how that works.
After your blood picks up oxygen, it goes back into your heart.
Then your heart sends it through your arteries so that oxygen is
delivered to all the cells in your entire body.
The blood cells
also pick up waste (stuff our body doesn't need), like
dioxide, and brings it back to your lungs so that you can exhale (breath
it out) to get rid of it.
Platelets help your body repair itself when you get hurt. They cause
your blood to clot so that you stop bleeding when you
get a cut.
If you had no platelets you would bleed to death if you got a cut
or scraped your knee.