Question

in human heart circulatory system valves are present in a) heart b) arteries c) veins d) both a and c ​

Answer 1

Answer:

Both (a) and (c).

Heart contains many valves including mitral valve, tricuspid valve, etc.

Veins contain valve to prevent backflow of blood.

Explanation:

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Answer 2

valves valves are present both in heart and veins. they are present in heart so that the pumped blood would not come back.

In veins, they are present to ensure forward flow of blood.

so the correct option is d(both a and c).

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