自身的神经系统利用肾上腺素，一种神经传递介质或者说是化学信使，把信号传递在身体的各个部位以刺激“战或逃反映”。
The autonomic nervous system USES the hormone adrenaline, a neurotransmitter, or chemical messenger, to send signals to various parts of the body to activate the fight-or-flight response.
CRF是一种神经传递介质，意味着它可以帮助脑细胞之间的信号传递，有些神经元“送出”CRF信号，而有些受体则会“接受”它。
CRF is a neurotransmitter, meaning it helps communicate signals between brain cells. Some neurons "send out" the CRF signal while others contain receptors to receive it.
随着时间的推移，它通过消耗神经细胞中一种叫做P物质(或称肽物质，一种神经传递介质)的化学物质来减轻疼痛，该物质使痛觉信号沿神经末梢传递至大脑。
Over time, it short-circuits pain by depleting nerve cells of a chemical called substance p, which helps transfer pain signals along nerve endings to the brain.
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