下图表示正反馈和负反馈的过程及其特点。在正常人体内,以下生理

下图表示正反馈和负反馈的过程及其特点。在正常人体内,以下生理过程属于正反馈的是:(    )

A.体温的调节                             B.受精卵分裂过程的启动

C.血糖浓度的稳定                         D.pH的稳定

 

答案

B

如图理解正反馈的含义;一种生理过程的效应,通过正反馈可以进一步放大;而通过负反馈该效应被抑制;所以体温、血糖浓度、PH值如果偏离正常值通过负反馈调节回到平衡状态;而受精卵分裂过程启动后,通过正反馈持续分裂;

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