ANATOMY

Detailed explanation-1: -Atrial Systole: At this phase, blood cells flow from atrium to ventricle and at this period, atrium contracts. Isovolumic Contraction: At this stage, ventricles begin to contract. The atrioventricular valves, valve, and pulmonary artery valves close, but there won’t be any transformation in volume.

Detailed explanation-2: -Cardiac cycle events can be divided into diastole and systole. Diastole represents ventricular filling, and systole represents ventricular contraction/ejection.

Detailed explanation-3: -Systole (left) typically refers to ventricular systole, during which the ventricles are pumping (or ejecting) blood out of the heart through the aorta and the pulmonary veins.

Detailed explanation-4: -The atrioventricular valves are closed during systole; therefore, no blood is entering the ventricles; however, blood continues to enter the atria though the vena cavae and pulmonary veins.

Detailed explanation-5: -There is a period called isovolumetric contraction during which the ventricles contract but the pulmonary and aortic valves are closed as the ventricles do not have enough force to open them. The atrioventricular valves also remain closed during the isovolumetric contraction period.