What causes the AV valves to close?
Understand the Problem
The question is asking about the factors or mechanisms that lead to the closure of the atrioventricular (AV) valves in the heart. This relates to cardiac physiology and how the heart functions during the cardiac cycle.
Answer
When ventricular pressure exceeds atrial pressure.
The final answer is that the AV valves close when ventricular pressure exceeds atrial pressure.
Answer for screen readers
The final answer is that the AV valves close when ventricular pressure exceeds atrial pressure.
More Information
Atrioventricular (AV) valves include the mitral and tricuspid valves, which prevent the backflow of blood from the ventricles to the atria during ventricular contraction.
Tips
A common mistake is to think that the atrial contraction closes the AV valves, but it is actually the increase in ventricular pressure.
Sources
- CARDIAC CYCLE - PDF - cvil.ucsd.edu
- Cardiac Cycle - UTMB Health, The University of Texas Medical Branch - utmb.edu
- What causes the atrioventricular valves to close? - homework.study.com
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