ANATOMY
CHEST AND CARDIOVASCULAR
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
The first sound of the heart is caused by the
|
|
Opening of the AV valves
|
|
|
Closing of the AV valves
|
|
|
Opening of the semilunar valves
|
|
|
Closing of the semilunar valves
|
Explanation:
Detailed explanation-1: -The first heart sound (S1) is produced by vibrations generated by closure of the mitral (M1) and tricuspid valves (T1). It corresponds to the end of diastole and beginning of ventricular systole and precedes the upstroke of carotid pulsation. Refer to the audio example below.
Detailed explanation-2: -The first heart sound (S1) is produced by the closure of the mitral and tricuspid valves in early systole, and is loudest near the apex of the heart. It is described as a Lubb, is more complex, is louder, and lasts longer than the second sound.
There is 1 question to complete.