Question

Closure of the pulmonic and aortic valves:

a. S1
b. S2
c. S3
d. S4

Answer 1

The closure of the pulmonic and aortic valves is represented by the second heart sound (S2) during ventricular diastole.

Step-by-step explanation:

In a normal, healthy heart, the closure of the pulmonic and aortic valves is represented by the second heart sound (S2). This sound occurs during ventricular diastole as the semilunar valves close to prevent backflow of blood from the aorta and pulmonary artery into the ventricles. S2 is typically described as a 'dub' sound.