Which of the following illustrates a positive feedback mechanism?
A)Maintaining blood pressure
B)Uterine contractions during childbirth
C)Body temperature control
D)Control of blood sugar

Question

Quizplus · Accepted Answer

Uterine contractions during childbirth is an example of positive feedback mechanism. This is because the pressure of the baby's head on the cervix causes nerve impulses that stimulate further contractions of the uterus, ultimately leading to the baby's delivery. This feedback loop is self-amplifying and leads to a definitive outcome, in this case, the birth of the baby. In contrast, the other options listed (A, C, and D) are all examples of negative feedback mechanisms, in which a regulatory response works to counteract or reverse the initial change in order to maintain homeostasis.

Which of the Following Illustrates a Positive Feedback Mechanism