Question

veins have valves but arteries do not have valves, but still the blood in the arteries do not flow in the reverse direction. Why​

Answer 1

Answer:

Valves are present in the veins situated below the level of the heart. These valves permit only unidirectional flow of venous blood towards the heart and also these valves helps to prevent backflow of venous blood due to gravity. Arteries don't need the valves as the valves may obstruct the blood flow away from the heart.

Answer 2

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Veins have valves because blood flows with less pressure and there are chances that it comes back. Thus to prevent blood from coming back it has valves whereas in arteries blood flows at high pressure so it won't come back. Thus, it doesn't have valves.