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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true. Heart sounds or lubb dubb are created when the valves of the heart snap shut
true. Arteries have halves that allow for blood flow away form the heard but not toward the heart.
The upper heart valves are called atriums, and the lower heart valves are called ventricles.
Valves can be found in the heart aswell as the veins
DESCRIBE THE ACTION OF HEART VALVES. WHEN DO THEY OPEN AND CLOSE?