During the normal events of the cardiac cycle, which of the following statements is true?
A) Electrical depolarization follows mechanical contraction.
B) Electrical depolarization precedes mechanical contraction.
C) Heart sounds precede electrical depolarization.
D) Heart sounds precede cardiac valve opening or closing.

Question

Quizplus · Accepted Answer

The P wave signals atrial depolarization. Within 0.1 sec, the atria contract, causing a slight rise in both atrial and ventricular pressures (the A waves).

During the Normal Events of the Cardiac Cycle, Which of the Following