Author Question: The second heart sound (S2) occurs because of the closure of the: A. Aortic valve B. Tricuspid ... (Read 66 times)

Awilson837 · **on:** Jun 25, 2018

The second heart sound (S2) occurs because of the closure of the:

A. Aortic valve
B. Tricuspid valve
C. Aortic and pulmonic valve
D. A and B

Question 2

The first heart sound (S1) occurs because of the closure of the:

A. Aortic and mitral valves
B. Mitral and tricuspid valves
C. Pulmonic valve
D. Aortic valve

jesse.fleming · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

ANS: C
S1 is the closing of the mitral valve and with the tricuspid (T1) valve; together they are known as the atrioventricular (AV) valves. S2 is the closing of the aortic (A2) and pulmonic (P2) valves; together they are known as the semilunar valves.

Answer to Question 2

ANS: B
S1 is the closing of the mitral valve and with the tricuspid (T1) valve; together they are known as the atrioventricular (AV) valves. S2 is the closing of the aortic (A2) and pulmonic (P2) valves; together they are known as the semilunar valves.