Sex steroids such as estrogens and testosterone influence the nervous system in many ways. Which of the following statements about their actions is correct?  雌激素和睾酮等性激素会以多种方式影响神经系统。关于它们的作用，下列哪项陈述是正确的？单项选择题

A

When acting in neurons, estrogens and testosterone always function independently of gene transcription.   雌激素和睾酮在神经元中发挥作用时，其功能始终独立于基因转录。

B

Estrogens and testosterone cannot cross the blood-brain barrier, so exert their effects exclusively through peripheral endocrine organs.  雌激素和睾酮不能穿过血脑屏障，因此只能通过外周内分泌器官发挥作用。

C

Estrogens and testosterone modulate synaptic plasticity and neurotransmitter systems in specific regions of the brain.  雌激素和睾酮调节大脑特定区域的突触可塑性和神经递质系统。

D

Estrogens and testosterone act on the nervous system only during a short “critical period” that occurs at puberty.  雌激素和睾酮只在青春期短暂的“关键期”内对神经系统起作用。

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