Heart sounds
3 important questions on Heart sounds
When does the heart make a noise?
Only when valves close, as the vanes and surrounding fluid vibrate due to pressure differentials
What is the second sound?
Closure of aortic and pulmonic valves during diastole (high pitch, short duration)
What is the third sound?
Middle of diastole when blood flows into almost empty ventricles, it is difficult to hear
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