It can be inferred from the passage that, before the experiments of Bayliss and Starling, most people believed that chemical integration occurred only __

A．during sleep

B．in the endocrine glands

C．under control of the nervous system

D．during strenuous exercise

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参考答案

答案解析

定位：根据题干信息before the experiments of Bayliss and Starling可将答案定位到第二段最后一句。
解析：该句提到： “贝利斯和斯塔林通过展示特殊的细胞能分泌出化学物质(它们通过血液进行传输。并能够调控远距离的目标器官或组织)，证明即便没有神经系统的参与，化学结合仍可能发生。，，而且本段第一句也提到“直至本世纪初，人们依然认为，人体内各部分的交流以及后续的行为整合只能在神经系统里进行”，由此可见，在贝利斯和斯塔林的实验之前，人们一直认为这一切都发生在神经系统里或必须有神经系统的参与。故选C。

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