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⸻ 2. Isovolumetric Contraction Mitral valve closes. Both valves are now closed. The ventricle contracts. Volume does not change. Pressure rises dramatically. This is where you hear S1.
4. Isovolumetric Relaxation Aortic valve closes. Both valves closed again. Pressure falls rapidly. Volume stays constant.
4. Isovolumetric Relaxation 4. Isovolumetric Relaxation Aortic valve closes. Both valves closed again. Pressure falls rapidly. Volume stays constant. This is S2. When LV pressure falls below LA pressure… Mitral valve opens and the cycle repeats.
Created by: Remarkable RN
 

 



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