CVS Practice Test

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the CVS Test with tailored quizzes, featuring flashcards and multiple-choice questions with explanations. Set yourself up for success!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

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

The correct answer is: 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.