Unidirectional flow in the heart is ensured because the heart contains that prevent backflow.

Unidirectional flow in the heart is ensured because the heart contains valves that prevent backflow.

Explanation:

Unidirectional flow of blood in heart means that blood flows in and out of the heart through the major blood vessels only in the forward direction and not in the backward direction by the action of the biomechanical flap or leaflet-like structured heart valves.

Backflow of blood leads to regurgitation and may disturb the entire circulation process.  A healthy or normal heart valve should open and close quickly to ensure that blood does not flow back.

The heart valves are: Tricuspid, bicuspid, pulmonary and aortic valves.

The backflow of blood from an atrium to a ventricle is prevented by the action of mitral and tricuspid valves; whereas the flow out from the ventricles is controlled by the action of aortic and the pulmonary valves.

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