Question

question 9
which of the following would increase glomerular filtration rate?
a vasodilation of the afferent arteriole
b vasoconstriction of the efferent arteriole
c antidiuretic hormone (adh)
d all of the above

Explanation:

• Option A: Vasodilation of the afferent arteriole allows more blood to flow into the glomerulus, increasing the glomerular filtration rate.
• Option B: Vasoconstriction of the efferent arteriole increases the resistance to blood outflow from the glomerulus. This leads to an increase in glomerular hydrostatic pressure (as blood has a harder time leaving), which in turn increases the glomerular filtration rate.
• Option C: Antidiuretic hormone (ADH) mainly acts on the collecting ducts to increase water reabsorption. It does not directly increase the glomerular filtration rate.

Answer:

A. Vasodilation of the afferent arteriole, B. Vasoconstriction of the efferent arteriole