Diastole, Atrial Systole, Ventricular systole

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6 Terms

1
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What are the three stages of the cardiac cycle?

Diastole, Atrial Systole, Ventricular Systole

2
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What happens during Diastole?

Atria contract, pushing blood into the ventricles (after the atrioles). Blood direction: Atria → Ventricles. Valve situation: AV open, semilunar closed

3
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What happens during Atrial Systole?

Ventricles contract, ejecting blood into the pulmonary artery + aorta. Ventricular pressure > Atrial pressure. AV valves close. Blood direction: RV → PA + LV → Aorta. Valve Situation: Semilunar valves open + AV valves closed to prevent backflow

4
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What happens during Ventricular Systole?

Ventricular Systole:

Ventricular systole is the phase of the cardiac cycle when the ventricles contract to pump blood out of the heart.

Key events:

  • Ventricular contraction increases pressure within the ventricles

  • Ventricular pressure exceeds atrial pressure, causing the AV valves (tricuspid and mitral) to close

  • Ventricular pressure exceeds arterial pressure, causing the semilunar valves (pulmonary and aortic) to open

  • Blood ejection occurs as the right ventricle pumps deoxygenated blood to the lungs via the pulmonary artery, and the left ventricle pumps oxygenated blood to the body via the aorta.

5
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What is the heart rate during the cardiac cycle?

75 bpm

6
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What percentage of time does each stage take?

Everything: 0.8s, AV: 0.1s, VS: 0.3s, D: 0.4s