PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
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What are the 3 factors that affect vascular resistance?
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Blood pressure, blood volume, blood vessel length
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Blood viscosity, blood vessel length, blood vessel diameter
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Blood volume, blood vessel length, blood vessel diameter
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blood pressure, blood volume, blood vessel diameter
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Explanation:
Detailed explanation-1: -The three most important factors affecting resistance are blood viscosity, vessel length and vessel diameter and are each considered below.
Detailed explanation-2: -The length of a vessel is directly proportional to its resistance: the longer the vessel, the greater the resistance and the lower the flow. As with blood volume, this makes intuitive sense, since the increased surface area of the vessel will impede the flow of blood.
Detailed explanation-3: -It has long been known that increased blood viscosity increases systemic vascular resistance and, secondarily, decreases total cardiac output in the intact circulation.
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