Which of the following is an example of negative feedback?
A) During birthing contractions, the hormone oxytocin is released and acts to stimulate further contractions.
B) When a baby is nursing, suckling leads to the production of more milk and a subsequent increase in the secretion of prolactin, which in turn stimulates lactation.
C) After a blood vessel is damaged, signals are released by the damaged tissues that activate platelets in the blood. These activated platelets release chemicals that activate more platelets.
D) When blood glucose concentration increases, the pancreas produces and releases the hormone insulin. Insulin acts to decrease blood glucose. As blood glucose decreases, the rate of production and release of insulin decreases.

Question

Quizplus · Accepted Answer

Negative feedback occurs when a change in a variable triggers a response that opposes the change, resulting in the restoration of the variable to its set point. In this case, as blood glucose concentration increases, insulin is released to bring it back to normal levels. As blood glucose decreases, the rate of production and release of insulin decreases, which is an example of negative feedback. Choices A, B, and C are examples of positive feedback, where a change in a variable triggers a response that amplifies the change, leading to further increase or decrease of the variable.

Which of the Following Is an Example of Negative Feedback