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AV valves opened

Semilunar valves opened. Semilunar valves closed. AV valves closed. AV valves closed. Semilunar valves closed. Semilunar valves closed. AV valves closed. AV valves opened. Semilunar valves closed. AV valves opened.

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AV valves opened

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  1. Semilunar valves opened Semilunar valves closed AV valves closed AV valves closed Semilunar valves closed Semilunar valves closed AV valves closed AV valves opened Semilunar valves closed AV valves opened 1.Systole: Period of isovolumic contraction. Ventricular contraction causes the AV valves to close, which is the beginning of ventricular systole. The semilunar valves were closed in the previous diastole and remain closed during this period. 2.Systole: Period of ejection. Continued ventricular contraction pushes blood out of the ventricles, causing the semilunar valves to open. 3.Diastole: Period of isovolumic relaxation. Blood flowing back toward the relaxed ventricles causes the semilunar valves to close, which is the beginning of ventricular diastole. Note that the AV valves closed, also. 5.Diastole: Active ventricular filling. The atria contract and complete ventricular filling. 4.Diastole: Passive ventricular filling. The AV valves open and blood flows into the relaxed ventricles, accounting for most of the ventricular filling.

  2. Semilunar valves closed AV valves closed Systole: Period of isovolumic contraction. Ventricular contraction causes the AV valves to close, which is the beginning of ventricular systole. The semilunar valves were closed in the previous diastole and remain closed during this period.

  3. Semilunar valves opened Semilunar valves closed AV valves closed AV valves closed Systole: Period of ejection. Systole: Period of isovolumic contraction.

  4. Semilunar valves opened AV valves closed Systole: Period of ejection. Continued ventricular contraction pushes blood out of the ventricles, causing the semilunar valves to open.

  5. Semilunar valves opened AV valves closed Semilunar valves closed AV valves closed Systole: Period of ejection. Diastole: Period of isovolumic relaxation.

  6. Semilunar valves closed AV valves closed Diastole: Period of isovolumic relaxation. Blood flowing back toward the relaxed ventricles causes the semilunar valves to close, which is the beginning of ventricular diastole. Note that the AV valves closed, also.

  7. Semilunar valves closed AV valves closed Semilunar valves closed AV valves opened Diastole: Period of isovolumic relaxation. Diastole: Passive ventricular filling.

  8. Semilunar valves closed AV valves opened Diastole: Passive ventricular filling. The AV valves open and blood flows into the relaxed ventricles, accounting for most of the ventricular filling.

  9. Semilunar valves closed AV valves opened Semilunar valves closed AV valves opened Diastole: Active ventricular filling. Diastole: Passive ventricular filling.

  10. Semilunar valves closed AV valves opened Diastole: Active ventricular filling. The atria contract and complete ventricular filling.

  11. Semilunar valves closed AV valves closed Semilunar valves closed AV valves opened Systole: Period of isovolumic contraction. Diastole: Active ventricular filling.

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