Question

what prevents back flow of blood inside the heart during contractions ​

Answer 1

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.

Answer 2

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Valves ensure that blood does not flow backewards when the atria or ventricles contract. Since ventricles have to pump blood into various organs with high pressure, they have thicker walls than atria . The separation of the right side and left side of heart by vlaue also to keep oxygenated and deoxygenated blood from mixing so as to supply high amount of oxygen to the body.