另一方面，蛋白质促进大脑生成降肾上腺素和多巴胺，这些是促进机体警觉和活跃的化学信使。
Protein, on the other hand, prompts the brain to manufacture norepinephrine and dopamine, chemical messengers that promote alertness and activity.
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.
迄今为止，大多数有关锻炼和焦虑的相互影响的研究都集中在大脑内的各种神经递质或化学信使，如血清素、多巴胺上。
To date, most research into the interplay of exercise and anxiety has focused on the actions of various neurotransmitters or chemical messengers within the brain, like serotonin and dopamine.
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