NEET PG DENTAL EXAM

Detailed explanation-1: -They are larger and hold more blood than the arteries. The blood passing through the veins is deoxygenated (except in pulmonary veins ) and flows at a low pressure. It flows slow and steady against the direction of gravity. Therefore, veins have valves to prevent the backflow of blood.

Detailed explanation-2: -A set of valves exist between each atrium and ventricle, preventing blood from flowing backwards into the atria. Another set of valves exist between the ventricle and arteries, preventing blood flow back into the ventricles.

Detailed explanation-3: -Heart valves control the flow of blood so that it moves in the right direction. The valves prevent blood from flowing backward. The heart has four valves. The tricuspid valve separates the right atrium and right ventricle.