Which of the following is an example of negative feedback?
A) Increased pressure in the aorta triggers mechanisms to lower blood pressure.
B) A rise in blood calcium levels triggers the release of a hormone that further raises blood calcium levels.
C) A rise in estrogen during the menstrual cycle increases the number of progesterone receptors in the uterus.
D) Increased blood sugar stimulates the release of a hormone from the pancreas that stimulates the liver to release blood sugar.
E) A increase in body temperature triggers a neural response that initiates physiological changes to increase body temperature.

Question

Quizplus · Accepted Answer

Negative feedback involves a response that counteracts or reverses a change in a physiological parameter in order to maintain homeostasis. In this case, an increase in blood pressure triggers mechanisms to lower blood pressure, which is a counteractive response. Options B, C, D, and E all describe examples of positive feedback, in which a change in a physiological parameter amplifies the change further away from the set point.

Which of the Following Is an Example of Negative Feedback