試題詳解

31Which of the following is an example of negative feedback control?
(A)During birthing contractions, oxytocin (a hormone) is released and acts to stimulate further contractions.
(B)When a baby is nursing, suckling produces more milk and a subsequent increase in the secretion of prolactin (a hormone that 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 the glucose level in the blood increases, the pancreas produces and releases the hormone insulin. Insulin acts to decrease blood glucose. As blood glucose decreases, insulin production and release rate decreases.