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58问答库 > 血液中甲状腺激素含量下降时，对垂体和下丘脑的分泌是促进还是抑制

血液中甲状腺激素含量下降时，对垂体和下丘脑的分泌是促进还是抑制

2025-04-07 18:44:46

推荐回答（2个）

回答（1）：

甲状腺激素在血液中的浓度下降，反馈至下丘脑，引起下丘脑分泌促甲状腺激素释放激素，促甲状腺激素释放激素作用于腺垂体，引起腺垂体的促甲状腺激素分泌增多，促甲状腺激素作用于甲状腺，令甲状腺释放更多的甲状腺激素入血，到后期促进更多的甲状腺激素合成直至血液的甲状腺激素浓度恢复正常水平。所以，是促进作用。

回答（2）：

答案c
手术后促甲状腺激素、甲状腺激素的含量、促性腺激素和性激素的含量含量都会降低，因为它们都是下丘脑的调控。

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