Question

heya !! I WANT A GOOD EXPLANATION OF ATRIAL SYSTOLE AND VENTRICULAR DIASTOLE (see the attached pic).
EXPLAIN CLEARLY.

#ch-THE CIRCULATORY SYSTEM (class 10th).

Answer 1

Hey!

Diastole is the period in which the heart relaxes after a contraction, called the systole period, in preparation for filling with circulatory blood. In ventricular diastole the ventricles relax, and in the atrial diastole the atria are relaxed. Together they are known as the cardiac diastole and constitute about half the duration of the cardiac cycle, that is, about 0.5 seconds.

During diastole the atria are filled with blood by the venous return from the tissues via the superior and inferior vena cava and there is a progressive increase of the intra-atrial pressure until the intra-ventricular pressure is exceeded.

During ventricular diastole, the pressure of the ventricles falls below the onset it reached during systole. When the pressure in the left ventricle falls below the pressure of the left atrium, the mitral valve opens, and the left ventricle is filled with blood that has been accumulating in the left atrium. 70% of the filling of the ventricles occurs without the need for atrial systole. Similarly, when the right ventricle pressure falls below that of the right atrium, the tricuspid valve opens, and the right ventricle is filled with blood accumulating in the right atrium.