Which of the following statements about the cardiac cycle is TRUE?

Question

Quizplus · Accepted Answer

During the cardiac cycle, atrioventricular valves close at the beginning of ventricular systole, preventing blood from flowing back into the atria. This is followed by the closure of the semilunar valves, which occurs after the QRS complex of the electrocardiogram. The duration of systole and diastole can vary depending on physical activity and other factors, but in a subject at rest, diastole is typically longer than systole. Blood flows from the atria into the ventricles during ventricular filling, which occurs before isovolumetric ventricular contraction. Therefore, choice C is the only statement that is true.

Which of the Following Statements About the Cardiac Cycle Is