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Compare and contrast systole and diastole

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Compare and contrast atrial and ventricular systole and atrial and ventricular diastole.

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Solution Summary

This solution compares and contrasts atrial and ventricular systole and atrial and ventricular diastole.

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Systole refers to a period of contraction by the heart muscle.
Diastole refers to a period of relaxation by the heart muscle.
Diastole = relaxation.
Systole = contraction.

Atrial Systole:
1) Both atria contract and push stored blood via AV (Atrioventricular) valves - The mitral valve & tricuspid valve into ventricles, to help fill them.
2) Volume of atria reduces and pressure increases.
3) Backflow of blood into the vein is prevented by closure of the valves in the veins.

Ventricular Systole:
1) After atria contracts, ventricles begin to contract.
2) Pressure in ventricles increases, blood is forced against AV valves which close to prevent backflow into the Atria, first heart sound.
3) Volume is reduced and blood is ejected through semilunar valves into the aorta on ...

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