BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS
CARDIOVASCULAR SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What are present in veins but absent in arteries?
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smooth elastic tissues
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muscular tissues
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valves
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None of the above
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Explanation:
Detailed explanation-1: -Structures called valves are present in veins and lymph ducts but are absent in arteries. These valves mainly prevent the backflow of blood in the vessels. Due to the high pressure of blood flowing n the arteries, they do not require valves to prevent backflow of the blood.
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