HISTOLOGY
BLOOD VESSELS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Tick 2-Why do Veins have Valves
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To Increase blood pressure
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To stop Blood flowing the wrong way
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To stop blood flowing upwards
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Because blood pressure is low
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Explanation:
Detailed explanation-1: -Veins have valves which stop the blood from flowing backward. This is because blood pressure in veins is very low (compared to arteries).
Detailed explanation-2: -Veins: Unlike arteries, veins don’t have to carry highly pressurized blood, but they do have to carry large volumes of deoxygenated blood back to your heart. Thin, less elastic walls help them handle high volumes and low pressure.
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