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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.
View Full Document. Efferent arteriole dialation will decrease the glomerular filtration rate and increase it when the arteriole is constricted. Blood pressure increased the filtration when it increases and decreases it as blood pressure drops.