CVS Practice Test 2025 - Free CVS Practice Questions and Study Guide

Question: 1 / 400

Which heart sound is produced by the closing of the mitral and tricuspid valves?

S1

The sound produced by the closing of the mitral and tricuspid valves is known as S1, also referred to as the "lub" sound. This occurs at the beginning of ventricular contraction (systole) when the ventricles contract to pump blood into the aorta and pulmonary artery. The closure of the atrioventricular valves (mitral and tricuspid) prevents the backflow of blood into the atria and marks the start of this phase in the cardiac cycle.

In contrast, S2 corresponds to the closure of the aortic and pulmonary valves at the end of ventricular contraction, while S3 and S4 are associated with specific heart conditions and represent additional sounds related to heart function. Thus, the production of S1 signifies the essential transition from diastole to systole facilitated by the closure of the mitral and tricuspid valves.

Get further explanation with Examzify DeepDiveBeta

S2

S3

S4

Next Question

Report this question

Download CVS Practice Test PDF Study Guide
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy