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What causes heart ventricles to fill with blood? I. Atrial contraction II. Closing of atrioventricular valves III. Opening of semilunar valves A. I only B. I and II only C. II and III only D. III only
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1 vote
What causes heart ventricles to fill with blood?

I. Atrial contraction

II. Closing of atrioventricular valves

III. Opening of semilunar valves

A. I only

B. I and II only

C. II and III only

D. III only

User Sam
by
8.3k points

1 Answer

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

User Rtp
by
8.2k points
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