Question

q: in a normal cardiac cycle, what is the correct sequence of mechanical events that follows the electrical stimulation represented by the p wave and qrs complex on an ecg?
description: sys2 heart obj1b
a. atrial systole (contraction) is followed by ventricular systole (contraction)
b: atrial systole (contraction) is followed by ventricular diastole (relaxation).
c: ventricular systole (contraction) is followed by atrial systole (contraction)
d: simultaneous atrial and ventricular systole (contraction).

Explanation:

The P wave on an ECG represents atrial depolarization, which leads to atrial systole (contraction). The QRS complex represents ventricular depolarization, which leads to ventricular systole (contraction). Atrial and ventricular systole do not occur simultaneously. After atrial systole (contraction), ventricular systole (contraction) occurs. Ventricular diastole (relaxation) does not immediately follow atrial systole in the normal sequence after P - wave and QRS complex. Also, ventricular systole does not precede atrial systole in this context.

Answer:

A. Atrial systole (contraction) is followed by ventricular systole (contraction)