heedlul1ada heedlul1ada

11-05-2016
Biology

Answered

What causes heart ventricles to fill with blood?

I. Atrial contraction

II. Closing of atrioventricular valves

III. Opening of semilunar valves

AI only

BI and II only

CII and III only

DIII only

Verified Answer :

princesslove1234 princesslove1234

13-05-2016

1 and 2 both have very important things to do with it

Answer Link

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