Phases of the cardiac cycle

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  • Phases of the cardiac cycle
    • Atrial systole
      • 1. atria contract
        • 2. Ventricles are relaxed
          • 3. AV valves open; semilunar valves close
            • 4. Sphincter muscles in vena cava and pulmonary vein contract.
    • Ventricular systole
      • 1. Ventricles contract
        • 2. Atria are relaxed.
          • 3. AV valves are closed; semilunar valves open
    • Diastole
      • 1. Ventricles are relaxed
        • 2. Atria are relaxed
          • 3. AV valves open; semilunar valves close

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