PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following has the greatest impact on blood flow resistance?
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Blood’s viscosity
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Length of a blood vessel
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Diameter of a blood vessel
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None of the above
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Explanation:
Detailed explanation-1: -Blood flow is slowest in the capillaries, which allows time for exchange of gases and nutrients. Resistance is a force that opposes the flow of a fluid. In blood vessels, most of the resistance is due to vessel diameter.
Detailed explanation-2: -Answer and Explanation: Answer d. halving the diameter of the vessel would increase its resistance to blood flow.
Detailed explanation-3: -Which of the following has the greatest eect on blood ow? You correctly answered: blood vessel radius.
Detailed explanation-4: -Several factors influence resistance (R) to blood flow. The most important factor is the vessel radius (r), such that R 1/r4; thus, when the radius is halved, resistance increases by a factor of 16.
There is 1 question to complete.