Question

part which prevents the backward flow of blood

Answer 1

the valves prevent the backward flow of blood.

Answer 2

Here u go

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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. Veins also have some one way valves that stops blood flowing backwards between each heart beat.