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yusuki yusuki
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Posts: 2318
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9 years ago
Which of the following actions causes the atrioventricular valves to close?
a.   increased intraventricular pressure
b.   depolarization at the AV node
c.   ventricular relaxation and backflow of blood
d.   contraction of the atria

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monosaccharidemonosaccharide
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9 years ago
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yusuki Author
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9 years ago
What I needed, thanks.
wrote...
9 years ago
Glad you found it helpful.
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