What controls kidney function?

The vertebrae kidney helps to keep the acidity of the body fluids constant by varying the amount of hydrogen ions. it secrets in the urine. you can confidently predict that these aspects of kidney function will be controlled by:





1. a hormone produced in the kidney itself


2. a negative feedback mechanism


3. a positive feedback mechanism


4. a hormone ultimately controlled by the brain


5. nerve impulses from the brain





which would be the correct one? thank you for your help What controls kidney function?
Pituitary hormones trigger the reactionWhat controls kidney function?
2. A negative feedback mechanism.


The body monitors the pH of the blood. It controls it by means of respiration and the kidneys. When the pH of the blood is low (acidic pH's - high levels of H+), more H+ is secreted, whereas if the blood is too basic (high pH means low levels of H+), the secretion of pH is reduced. ';In maintaining the pH of the blood within its normal limits of 7.3鈥?.4, the kidney can produce a urine with a pH as low as 4.5 or as high as 8.5.';





In a feedback loop, there is a stimulus and a response. The response in a negative loop tends to reduce or eliminate the stimulus. Thus, too much H+, and the body gets rid of some - classic!