Which Event Typically Occurs at the Start of a Cardiac

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.