Which of the following is an example of positive feedback?
A) After eating a meal containing high glucose levels, the pancreas secretes more insulin, a hormone that lowers blood glucose levels.
B) After cutting your finger, the injured tissue releases chemicals that activate platelets in the blood. These activated platelets release chemicals to activate more platelets, leading to the formation of a blood clot.
C) An elevation in blood pressure causes heart rate to decrease, thereby causing blood pressure to decrease.
D) The secretion of the hormone TSH stimulates the thyroid gland to secrete thyroxine. Thyroxine, in turn, inhibits the secretion of TSH.

Question

Quizplus · Accepted Answer

Positive feedback occurs when a process is amplified or intensified. In this example, the process of blood clotting is activated by the release of chemicals from injured tissue. Once platelets are activated, they release more chemicals that activate more platelets, amplifying the process and leading to the formation of a blood clot.

Which of the Following Is an Example of Positive Feedback