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Biology, 28.09.2019 04:40 kingbudd129

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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What causes heart ventricles to fill with blood?

i. atrial contraction

ii...
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