HISTOLOGY
URINARY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Afferent arterioles constrict causing decrease in filtration due to
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lack of blood
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blood backing up into glomerulus
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protein concentrations
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None of the above
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Explanation:
Detailed explanation-1: -Afferent arteriole constriction leads to decreased GFR and decreased RPF, resulting in no change in FF. One important function of prostaglandins is to dilate the afferent arteriole.
Detailed explanation-2: -Overall the constriction of the afferent arteriole decreases both blood flow and filtration pressure where as constricting the efferent arteriole decreases blood flow but increases filtration pressure.
Detailed explanation-3: -Falling blood pressure does the opposite: dilate the afferent arteriole and preserve blood flow to the kidney. Secondly, the renin-angiotensin-aldosterone system acts to preserve GFR. The juxtaglomerular cells in the afferent arteriole release renin in response to decreased stretch.
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