When a patient's blood pressure drops,which physiologic mechanism helps maintain adequate glomerular blood flow?

Question

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When the mean arterial blood pressure is decreased,the afferent arteriole dilates and the efferent arteriole constricts to maintain a higher pressure in the glomerular capillary bed and maintain the glomerular filtration rate at 125 mL/min.The ability of the kidneys to autoregulate blood flow begins to fail when the mean arterial blood pressure is less than 80 mm Hg or greater than 180 mm Hg.

When a Patient's Blood Pressure Drops,which Physiologic Mechanism Helps Maintain