In mammals, veins differ from arteries in having

Thicker walls

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Deeply present

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Carry blood away from heart

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Internal valves

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Solution

The correct option is C Internal valves
Veins carry deoxygenated blood (with the exception of pulmonary veins and umbilical vein) from different parts of the body to the heart. They have thin, elastic muscle layer with semilunar valves that prevent the blood from flowing in the opposite direction.
So, the correct answer is option D.

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Similar questions

Blood in the arteries flow with _______ pressure than blood in the veins. Therefore,the walls of the arteries are ________ than 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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