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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.
The afferent arteriole in a nephron is a larger diameter then the outgoing efferent arteriole and this increase the blood pressure in the glomerulus capillaries resulting in t â¦ he ultrafiltration of the blood into the Bowman's capsule.he structure of an arteriole is:             Arterioles are tiny branches of arteries that lead to capillaries.   These are also under the co â¦ ntrol of the sympathetic nervous system, and constrict and dialate, to regulate blood flow. 7 people found this useful. Answered.