Constriction of the efferent artriole would cause
A)a decrease in GFR
B)a decrease in the hydrostatic pressure inside the glomerulus
C) an increase in renin release
D)in increase in albumin excretion
E) an increase in filtration
C) an increase in renin release
The constriction of the efferent arteriole, which carries blood away from the glomerulus, can have several effects on the kidney.
One possible effect is an increase in glomerular filtration rate (GFR). When the efferent arteriole constricts, it decreases the outflow of blood from the glomerulus, causing an increase in pressure within the glomerulus. This increased pressure promotes filtration of fluid and solutes across the filtration membrane, leading to an increase in GFR. Therefore, option E) "an increase in filtration" is a possible consequence of efferent arteriole constriction.
Option D) "an increase in albumin excretion" is not directly caused by efferent arteriole constriction. Albumin is a protein that is usually not filtered across the glomerular membrane in significant amounts. An increase in albumin excretion would typically be a sign of glomerular dysfunction or damage.
Option B) "a decrease in the hydrostatic pressure inside the glomerulus" is incorrect. Constriction of the efferent arteriole actually increases the hydrostatic pressure within the glomerulus, as mentioned earlier.
Option C) "an increase in renin release" is also not directly related to efferent arteriole constriction. Renin release is primarily regulated by changes in blood pressure, sodium levels, and sympathetic nervous system activity. Efferent arteriole constriction may indirectly affect renin release by altering the overall blood pressure in the kidney, but it is not a direct consequence.
Therefore, the correct answer is A) "a decrease in GFR" is not a consequence of efferent arteriole constriction.