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Which of the following affects blood volume?

Select one:

AThe speed at which the blood flows
BThe strength at which the heart contracts
CThe amount of water present in the blood
DThe rate at which the heart contracts

Verified Answer :

degenangel

I think that it is D. D because the rate that your heart contracts is how much it is pumping. If you have adrenaline pumping through you, your heart is contracting faster and your blood is thicker by it. But when you calm down your blood goes back to normal.