ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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: -Although SVR is primarily determined by changes in blood vessel diameters, changes in blood viscosity also affect SVR. SVR can be calculated if cardiac output (CO), mean arterial pressure (MAP), and central venous pressure (CVP) are known.
Detailed explanation-3: -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.
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