39. How would a decrease in the number of corticosteroid receptors in the hypothalamus affect levels of corticosteroids in the
blood?
(A)Blood levels will rise due to a failure in positive feedback.
(B)Blood levels will rise due to a failure in negative feedback.
(C)Blood levels will decline due to a failure in positive feedback.
(D) Blood levels will decline due to a failure in negative feedback.
(E)Blood levels will not change because there are no receptors to respond to corticosteroids.
答案:登入後查看
統計: A(9), B(116), C(21), D(20), E(12) #938834
統計: A(9), B(116), C(21), D(20), E(12) #938834
詳解 (共 3 筆)
#5444999
下視丘接受壓力刺激後,刺激腦下腺前葉釋出ACTH,刺激腎上腺皮質分泌一系列的corticosteroids(皮質類固醇),如:cortisol、aldosterone。交感神經系統的神經元刺激腎上腺髓質分泌NE、Epi。
腎上腺不會監測Ca2+的量;胰臟的Beta細胞才可分泌insulin ;且腎上腺皮質及髓質不會分泌ACh
5
0
#6530892
(A) 錯 皮質醇的調節是「負回饋」,不是正回饋
(C) 錯 負回饋失靈會讓濃度「上升」,不是下降
(D) 錯 雖然是負回饋失靈,但失靈會導致「濃度上升」,不是下降
(E) 錯 即使 receptor 減少,皮質醇仍會產生,血中濃度仍會變高,不是「沒有反應就沒變化」
ㅤㅤ
0
0