Veins contain _________valves.

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Solution

Veins :
These are the blood vessels that carry deoxygenated blood from different tissues of the body toward the heart.
Semilunar valves :
These valves guard the opening to the pulmonary artery and the ventricles to prevent blood from returning to the atria when the ventricles contract.
The innermost lining of the veins and tunica intima contains this( semilunar) valve.
Veins contain semilunar valves

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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).

why veins contain valves whereas aeteries do not have?

Q. Which one of the following does not have valves?
(a) heart
(b) arteries
(c) capillaries
(d) veins

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