What is true about heart valves?
a. they enforce a one-way blood flow through the heart.
b. they operate passively (no active contraction required).
c. they separate atria from ventricles, and ventricles from the large arteries that leave them.
d. they enforce a one-way blood flow through the heart, operate passively (no active contraction required), and separate atria from ventricles, and ventricles from the large arteries that leave them?
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