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What is the cardiac cycle?

1) ventricular filling
2) isovolumetric contraction
3) ventricular ejection
4) Isovolumetric relaxation

relationship between pressure and volume

Inversely related, as one goes up, the other goes down

What happens during ventricular filling

Ventricular muscle relaxes, intraventricular volume increases and pressure drops below atrial pressure. AV valves open as blood flows into the ventricles, atria contract to top off the ventricles.

When do the atrium contract?

ventricular filling

When does the AV valve open?

Ventricular filling

What happens during isovolumetric contraction?

Systole begins, but no blood pumped out of the ventricles yet, pressure rises in ventricles, AV valves close to prevent backflow into atria

When do AV valves close?

during isovolumetric contraction

What happens during ventricular ejection?

Ventricles continue to contract, pressure in ventricles rise above the pressure in aorta and pulmonary artery, semilunar valves open, blood moves out of ventricles

When does blood move out of ventricles?

Ventricular ejection

The ejection fraction

The amount of blood pumped out of the ventricles (usually about 60%)

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