If there is an increase in systemic blood pressure, the resulting stretch of afferent arterioles results in reflexive vasodilation of efferent arterioles to lower GFR vasodilation of afferent arterioles to keep GFR normal vasoconstriction of efferent arterioles to raise GFR vasoconstriction of afferent arterioles to keep GFR normal
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Under normal conditions, an increase in systemic blood pressure will lead to... a) a vasodilation of the afferent arteriole to increase glomerular blood pressure b) a vasoconstriction of the afferent arteriole to increase glomerular blood pressure. c) a vasodilation of the afferent arteriole to keep glomerular blood pressure constant d) a vasoconstriction of the afferent arteriole to keep glomerular blood pressure constant e) none are correct
Madhur L.
UNIT (cont.) REGULATION GFR page systemic BP increases or decreases (circle one). During exercise, smooth muscle in the wall of the arteriole will relax, causing the arteriole to dilate. In both conditions, the GFR meter reads the autoregulation by the arteriole. Myogenic mechanisms: vascular smooth muscle cells will contract when stretched, which will decrease blood flow into the glomerulus. Conversely, vascular smooth muscle cells will relax when not stretched, which will increase blood flow into the glomerulus. Note that the low BP of the patient causes a strong baroreceptor reflex, which increases APs along with causing vasoconstriction of the afferent arterioles. This causes the GFR to decrease to conserve blood volume and BP.
Adi S.
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