heedlul1ada heedlul1ada

11-05-2016
Biology

contestada

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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princesslove1234 princesslove1234

13-05-2016

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

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