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

septa

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valves

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arteries

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thick walls

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Solution

The correct option is B
valves

Veins carry blood from the body back to the heart, so they need these one-way valves to prevent blood from flowing backward.

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Similar questions

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

Complete the following statements by filling in the blanks from the choices given in the bracket.
(a) The blood vessel that begins and ends in capillaries is the ... (hepatic artery. Hepatic portal vein, hepatic vein)
(b) A blood vessel which has a small lumen and thick walls is (capillary, lymphatic duct, artery, venule)
(c) the valve which prevents backflow of blood in the veins and lymph vessels... (mitral valve, tricuspid valve, semilunar valve).

Q. State the true statements of the following:

(1)

Blood flowing in arteries is without high pressure.

(2)

Blood flowing in veins is without high pressure.

(3)

Veins have valves opening towards heart.

(4)

Arteries have valves opening towards heart.

Q. Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?

Q. How do veins prevent back flow of blood?

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

The correct option is B valves Veins carry blood from the body back to the heart, so they need these one-way valves to prevent blood from flowing backward.

The correct option is B
valves

Veins carry blood from the body back to the heart, so they need these one-way valves to prevent blood from flowing backward.