Question

what prevents back flow of blood inside the heart during contraction?

Answer 1

Hey mate, here is your answer :

Contraction of the atria, during which the chambers (atria or auricles) discharge the blood. This occurs in the heart during the cardiac cycle.

Valves between the atria (auricles) and ventricles of the heart which prevent the backflow of blood into the atria, i.e. the bicuspid (mitral) and tricuspid valves.Valves prevent back flow of blood inside the heart. Tricuspid and bicuspid valves are the valves present in the heart.

Hope this answer helps you...

Answer 2

Answer:

The pulmonary valve sits between the right ventricle and the pulmonary artery. Its role is to prevent the backflow of blood into the right ventricle after it contracts. The aortic valve sits between the left ventricle and the aorta and prevents backflow of blood into the left ventricle after it contracts.