試題詳解

74. Which of the following statements is (are) positive feedback?
(A) The hormones stimulate uterus contraction when child-birth occurs in mammals.
(B) A nursing infant's sucking increases the secretion of a milk-releasing hormone in the mother.
(C) An increase in calcium concentration increases the secretion of a hormone that stores calcium in bone.
(D) Both A and B.
(E) All of A, B, and C.