A primary reason that the kidneys have one of the highest metabolic rates of all body organs is that
A) it stores the body's excess fats.
B) it has membranes of varying permeability to water.
C) it operates an extensive set of active-transport ion pumps.
D) it is the body's only means of shedding excess nutrients.
E) it has an abundance of myogenic smooth muscle.

Question

Quizplus · Accepted Answer

The kidneys have an extensive set of active-transport ion pumps, requiring a high metabolic rate to function properly. These pumps move ions against their concentration gradients, which requires energy. This high energy demand contributes to the kidney's high metabolic rate.

A Primary Reason That the Kidneys Have One of the Highest