a: Red blood cells ~
b: oxygen barges
What:
They move oxygen around the body the way barges moves stuff up and down the Mississippi river. Of course the red blood cells can only carry 4 oxygen molecules/hemoglobin molecule. But there are many of these little boats, about 45% of the blood, so the system works pretty well.
Useful?
Writer: Not Stated
LCC:
Where: Reference Link Has Evaporated
Date: Dec 6 2014 3:38 PM
# 6630 Critique Analogy