AP BIOLOGY

Detailed explanation-1: -During diastole, blood flowing from central veins fills the atrium and partially fills the ventricle, passing through the sinus venosus, the sino-atrial (SA) canal and the atrio-ventricular (AV) canal.

Detailed explanation-2: -Diastole is the period of the cardiac cycle that encompasses ventricular relaxation, passive and active filling of blood into the heart, and the period just prior to ejection. At the cellular level, the interplay of calcium within the cardiac myocytes is crucial to ventricular relaxation.

Detailed explanation-3: -Filling Phase In diastole, both the atria and the ventricles are relaxed. Blood flows from the vena cava and pulmonary veins into the right and left atria respectively, before flowing directly into the ventricles.

Detailed explanation-4: -What is the Goal of Diastole? Diastole occurs in order for the left ventricle (LV) to fill adequately with enough blood, at a low enough pressure, to prevent pulmonary congestion from occurring. This process is referred to as, diastolic function.