The vertebrate kidney helps to keep the acidity of body fluids constant by varying the amount of hydrogen ions (H+) it secretes into the urine. You can confidently predict that this aspect of kidney function will be controlled by
A) a positive feedback mechanism.
B) a negative feedback mechanism.
C) nerve impulses from the brain.
D) a hormone produced in the kidney itself.

Question

Quizplus · Accepted Answer

Negative feedback mechanisms are used to maintain homeostasis within the body. In this case, if the acidity of the body fluids increases, the kidney will secrete more H+ ions into the urine, thus decreasing the acidity of the body fluids. This process is regulated by a negative feedback mechanism, as it helps maintain a stable level of acidity in the body.

The Vertebrate Kidney Helps to Keep the Acidity of Body