Positive Feedback Has Occurred When

Question

Positive feedback has occurred when
A)an increase in blood sugar increases the secretion of a hormone that stimulates the movement of sugar out of the blood.
B)a decrease in blood sugar increases the secretion of a hormone that increases the conversion of glycogen to glucose.
C)uterine contractions needed for the birthing process are expedited by the pressure of a moving baby in its mother's uterus.
D)an increase in calcium concentration increases the secretion of a hormone that promotes the storage of calcium in bone.
E)a decrease in blood calcium increases the amount of the hormone that causes the release of calcium from bone.

Accepted Answer

Positive feedback occurs when a stimulus or change in the body triggers a response that amplifies or increases the original stimulus. In this case, the pressure of a moving baby in the mother's uterus triggers uterine contractions that increase in intensity, which in turn further increases the pressure of the baby on the cervix, leading to even stronger contractions. This positive feedback loop continues until the baby is born. The other answer choices involve negative feedback, which occurs when a stimulus triggers a response that counters or reduces the original stimulus.