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In contrast, constriction of the efferent arteriole decreases blood flow out of the glomerulus, and this increases the glomerular hydrostatic pressure and leads to an increase in GFR. Both the afferent and efferent arterioles are regulated through hormones (and drugs that inhibit the hormones).he afferent arteriole is in red, and the efferent arteriole in blue. The glomerular filtration rate (GFR) depends on the pressure difference between the two, which affects the hydrostatic pressure at the glomerulus.
If all other variables are kept constant, how does the efferent arteriole radius affect the rate of glomerular filtration (select all that apply)? You correctly answered: a. An increased efferent arteriole radius will decrease the rate of glomerular filtration. b. A decreased efferent arteriole radius will increase the rate of glomerular filtration. 3. If all other variables are kept constant, how does blood pressure affect the rate of glomerular filtration (select all that apply)?