PATHOLOGY MCQ
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Increasing in breathing rate to increase the oxygen in the bloodstream
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Increase in process of gaseous exchange
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Reducing of the diameter of small arteries to reduce blood flow to tissues
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Increasing the diameter of small arteries to increase blood flow to tissues
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Detailed explanation-1: -Vasodilation is the widening of blood vessels as a result of the relaxation of the blood vessel’s muscular walls. Vasodilation is a mechanism to enhance blood flow to areas of the body that are lacking oxygen and/or nutrients.
Detailed explanation-2: -Vasodilation, also known as vasorelaxation, is the widening of blood vessels. It results from relaxation of smooth muscle cells within the vessel walls, in particular in the large veins, large arteries, and smaller arterioles. The process is the opposite of vasoconstriction, which is the narrowing of blood vessels.
Detailed explanation-3: -Vessel baseline diameter is inversely proportional to the level of vasodilation obtained after reactive hyperemia stimulus (major arteries dilate less that smaller arteries) and there is variability in arterial diameter from individual to individual.
Detailed explanation-4: -As the radius of the vessel lumen increases (called vasodilation), blood flow increases dramatically, and vice versa [1].