How does the blood flow through the heart during different phases of cardiac cycle?
Answers
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Explanation:
Answer:
there are two phases :- daiastole and systole
Explanation:
In diastole phase, blood return to the heart from the superior and interior venacava and flows in to right atrium . the pressure in the right atrium increases as blood flow into it. when the pressure of right atrium exceeds the pressure of right ventricle. At the same time the oxygenated blood returning from the lungs flow into left atrium . As left atrial pressure increases ,the mitral valve opens and blood flow into left ventricle.
In systole phase ,blood is forced to flow from two Atria into their respective ventricles as the atrial muscle contract due to depolarization of the atria. there is a periodic called involumetric contractions during which the ventricle contract but the pulmonary and aortic valve are closed as the ventricle do not have enough force to open them . the artioventricular valve also remain closed during the isovolumetric contractions period. the semilunar valve opens when the ventricular muscle contract and generate blood pressure within the ventricle higher than within the arterial tree.
when the heart muscle relaxe the diastole phase begins again.
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