化学信使

多巴胺是哺乳动物大脑神经细胞间的化学信使。

Dopamine is a neurotransmitter , a chemical messenger between nerve cells in the mammalian brain .

答：这套自动神经系统利用肾上腺激素（一种神经递质，或者称为化学信使）把信号发送到身体的各个部分，以便激活“斗争还是逃避”反应。

A : 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 .

神经传递素是大脑中的化学信使，特定神经传递素帮助调节情绪。

Neurotransmitters are the brains chemical messengers , and specific neurotransmitters help to regulate mood .

帕金森发生时，脑细胞-神经细胞-即释放化学信使称为多巴胺死。

Parkinson 's occurs when the brain cells-neurons-that release the messenger chemical known as dopamine die .

肌肉的性能也受被称之为“中央疲倦”现象的影响，即身体中传递化学物质的信使不均衡，导致中央神经系统不能有效地指导肌肉运动。

Muscle performance can also be affected by a phenomenon called " central fatigue , " in which an imbalance in the body 's chemical messengers prevents the central nervous system from directing muscle movements effectively .

272829肌肉的性能也受被称之为“中央疲倦”（27）现象的影响，即身体中传递化学物质的信使不均衡，导致中央神经系统不能（28）有效地指导肌肉运动。

Muscle performance can also be affected by a called " central fatigue , " in which an imbalance in the body 's chemical messengers prevents the central nervous system from directing muscle movements .