Respuesta :
Answer:
First heart sound
Explanation:
First heart sound is the sound produced by the heart heard only by the stethoscope.
The first heart sound is not easily heard as the frequency of the sound iv very low and thus is considered low pitched sound.
The first sound is produced by the closure of the mitral cuspid in the left heart when the left ventricle is full and the tricuspid blood when the right ventricle is filled with blood.
The closure of these valves is followed by the ventricular contraction therefore the closure of these valves is considered the initial stage of the systole.
Thus, first heard sound is the correct answer.
Answer: First sound of heart.
Explanation:
The first heart sound and the second heart sound (S 1 and S 2) are produced by the closing of the atrioventicular valves and the semi lunar valves.
Other sounds such as adventitious sounds, gallop rhythms and heart murmur are also produced from the heart.
The sound of the heart has very low frequency and hence it requires stethoscope to hear these sounds.
The first sound in the heart is produced when the mitral cuspid closes in the left heart when the left ventricle is full of blood and in the tricuspid valve when the right ventricle is full of blood.
