Which Event Typically Occurs at the Start of a Cardiac

question 21

Multiple Choice

Which event typically occurs at the start of a cardiac cycle?

• A) Ventricular blood pressure drops until reverse blood flow pushes the cusps of the semilunar valves together.
• B) Atrial contraction forces a small amount of blood into the relaxed ventricles.
• C) The semilunar valves open and blood is ejected.
• D) Ventricular contraction pushes the atrioventricular valves closed.
• E) The ventricles fully contract.

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