Biology Body Fluids and Circulation Circulatory Pathways and Human Circulatory System Single Correct MCQ
Published on: August 11, 2026

In mammals, veins differs from arteries in having

A
Thicker walls
B
Deeply present
C
Carry blood away from heart
D
Internal valves

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The correct answer is:
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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.

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