Question

What prevents the backflow of blood inside the heart during contraction?

Heart chambers

Heart valves

Lungs

Arteries​

Answer 1

Explanation:

As the heart pumps blood, a series of valves open and close tightly. These valves ensure that blood flows in only one direction, preventing backflow. The tricuspid valve is situated between the right atrium and right ventricle. The pulmonary valve is between the right ventricle and the pulmonary artery.

Answer 2

Heart valves ...........

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