a: veins ~
b: part of a two way street

What:

The blood pumping through the human body, and many other animals, can be thought of as a two way street with road separated by a wide distance. Blood goes out from the heart on one road and returns on another.


Useful?
Writer: Lucrezia
LCC:
Where: Reference Link Has Evaporated
Date: Jul 25 2015 4:04 PM


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