What does the closure of the mitral and tricuspid valves during ventricular systole correspond to?
Understand the Problem
The question is asking about the specific heart sound that corresponds to the closure of the mitral and tricuspid valves during ventricular systole. This relates to the physiological understanding of the heart sounds generated by the cardiac cycle.
Answer
First heart sound (S1).
The closure of the mitral and tricuspid valves during ventricular systole corresponds to the first heart sound, known as S1.
Answer for screen readers
The closure of the mitral and tricuspid valves during ventricular systole corresponds to the first heart sound, known as S1.
More Information
The first heart sound, S1, is often described as the 'lub' sound in the 'lub-dub' sequence of heartbeats and is caused by the closure of the atrioventricular valves (mitral and tricuspid valves) when ventricular pressure exceeds atrial pressure at the start of ventricular systole.
Tips
A common mistake is confusing the first heart sound (S1) with the second heart sound (S2), which is caused by the closure of the semilunar valves (aortic and pulmonary).
Sources
- Cardiac Cycle - Cardiology Part 1 - utmb.edu
- Cardiac Cycle - an overview | ScienceDirect Topics - sciencedirect.com
- Heart Sounds - Medscape Reference - emedicine.medscape.com
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