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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Similar questions

How do veins prevent back flow?

Name the valve which prevent the back flow of blood in the veins ?

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.

Listed below are some properties of types of blood vessel. Separate them into three groups as

(1) Arteries (2) Veins (3) Capillaries

a) carry blood to the heart

b) carry blood from the heart

c) have thick elastic walls

d) blood flows through them in pulses

e) oxygen and food pass through the walls

f) have valves to prevent back-flow

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