If your body is dehydrated, the control center in the brain will stimulate the release of a hormone which causes the reabsorption of water into the blood during urine formation. When the control center senses that enough water is reabsorbed, it will stop the release of the hormone. This is an example of
A) a negative feedback mechanism.
B) a positive feedback mechanism.
C) response to external stimuli.
D) lack of control over homeostasis.
E) a combination of negative and positive feedback.

Question

Quizplus · Accepted Answer

This is an example of a negative feedback mechanism because the release of the hormone is triggered by a decrease in water levels (a deviation from the set point), and the release of the hormone is reduced or stopped when the water levels return to normal, thereby reversing the change and maintaining homeostasis.

If Your Body Is Dehydrated, the Control Center in the Brain