LO5: Describe the function of the heart valves and the origin of normal heart sounds
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6 Terms
What is the main function of the heart valves?
To prevent blood from flowing backward and ensure it moves in one direction through the heart.
Name the two types of heart valves.
Atrioventricular (AV) valves and semilunar (SL) valves.
Where are the AV valves located and what do they do?
Between the atria and ventricles; they open to let blood flow into ventricles and close to stop backflow during ventricular contraction.
Where are the SL valves located and what do they do?
At the bases of the pulmonary trunk and aorta; they open to let blood flow out of the heart and close to stop backflow into ventricles.
What causes the “lub” heart sound?
The closing of the AV valves at the start of ventricular systole.
What causes the “dub” heart sound?
The closing of the semilunar valves at the start of ventricular diastole.