Question

When regulating glomerular filtration, if I want to increase GFR then I can expect to see....

When regulating glomerular filtration, if I want to increase GFR then I can expect to see. (Mark all that apply)

a. Constriction of the afferent arteriole

b. Constriction of efferent arteriole

c. Dilation of the afferent arteriole

d. Dilation of the efferent arteriole

Science   Anatomy-And-Physiology   
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Answer #1

dilatation of afferent arteriole and constriction of efferent arterioles will increase the GFR.

EXPLANATION- When afferent arteriole are dilated, then the amount of blood going towards the filtration membrane increases. Also dilatation will cause reduced vascular resistance to flow of blood. Both these factors together increases the GFR.

When efferent arteriole are constricted, the less blood moves away from filtration membrane. This will increase the pressure gradient against which blood is filtered. High pressure gradient means high GFR.

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