Question

With greater sympathetic stimulation, however, as occurs during exercise or hemorrhage, vasoconstriction of the afferent arterioles predominates. As a result, blood flow into glomerular capillaries is greatly decreased, and GFR drops.The lowering of renal blood flow has two consequences:

Answer 1

With greater sympathetic stimulation, vasoconstriction of the afferent arterioles predominates, resulting in a decrease in blood flow into the glomerular capillaries and a drop in GFR. This occurs during exercise or hemorrhage. Stress and low blood pressure can also trigger vasoconstriction and reduce renal blood flow and GFR.

Step-by-step explanation:

With greater sympathetic stimulation, vasoconstriction of the afferent arterioles predominates, leading to a decrease in blood flow into the glomerular capillaries and a drop in glomerular filtration rate (GFR). This occurs during exercise or hemorrhage. Sympathetic nervous activity increases under stress, resulting in vasoconstriction of the afferent arterioles and redirection of blood to organs with immediate needs. Additionally, blood pressure may stimulate the release of renin, leading to increased production of angiotensin II, a vasoconstrictor, which further decreases renal blood flow and GFR.