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Neurotransmitters are chemicals that nerve cells use to communicate with other parts of the body.
神经递质是神经细胞用来与身体其他部位细胞交流的化学物质。
When a nerve cell releases a chemical, it is detected by a receptor in a different cell.
当神经细胞释放化学物质时，这种物质会被另一个细胞中的受体检测到。
This gives the body a signal to do something.
这就给了身体一个特定的信号。
Some neurotransmitters control functions like moving or breathing.
一些神经递质控制着运动或呼吸等功能。
Others control emotions and learning processes.
还有一些则调控情绪和学习过程。
There are over 100 known types of neurotransmitters, all with different purposes.
已知的神经递质有100多种，且目的各不相同。
An imbalance of neurotransmitters can cause both mental and physical illnesses.
神经递质分泌失衡会导致精神和身体疾病。
For example, people who struggle with depression may have low levels of the chemical called serotonin, which helps to regulate emotions.
例如，抑郁症患者体内可能五羟色胺含量较低，而这种化学物质有助于调节情绪。
Other commonly known neurotransmitters include dopamine, which responds to rewards, and adrenaline, which responds to danger.
其他常见的神经递质包括对奖励做出反应的多巴胺和对危险做出反应的肾上腺素。
