How do veins prevent back flow of blood?

The pressure exerted by the heart pushes the blood back

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The valves in the veins prevent back flow of blood

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The suction in the heart pulls up the blood

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The stroke volume increases and pushes the blood back

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Solution

The correct option is B The valves in the veins prevent back flow of blood
The valves in the veins are unidirectional. They allow blood flow in only one direction and hence they prevent blood from flowing back.

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Veins have valves to prevent the backflow of blood because the blood in veins flow ________.

Due to presence of _______ , back flow of blood is prevented in veins.

Veins and arteries carry blood. Which of these carry blood :
(a) away from the heart ?
(b) back to the heart ?

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