Asked by Danielle Harris on Jun 13, 2024
Verified
The first and second heart sounds are most directly related to
A) pulse pressure in the aorta.
B) the contraction of the atria.
C) vibrations that occur when the valves close.
D) contraction of the papillary muscles.
E) the flow of the blood.
Papillary Muscles
Muscle projections from the ventricular walls of the heart that attach to the chordae tendineae and prevent inversion of the valves during contraction.
Atria Contraction
The process during the cardiac cycle where the atria chambers of the heart contract to move blood into the ventricles.
Pulse Pressure
The difference between systolic and diastolic blood pressure, indicating the force that the heart generates each time it contracts.
- Describe the relationship between heart valve function and heart sounds.
Verified Answer
JL
Johnson Liu LiangJun 17, 2024
Final Answer :
C
Explanation :
The first and second heart sounds are primarily related to the vibrations that occur when the heart valves close. The first sound (S1) is associated with the closure of the mitral and tricuspid valves at the beginning of ventricular systole, while the second sound (S2) is associated with the closure of the aortic and pulmonary valves at the beginning of ventricular diastole.
Learning Objectives
- Describe the relationship between heart valve function and heart sounds.