Any of a group of peptide hormones that bind to opiate receptors and are found mainly in the brain. Endorphins reduce the sensation of pain and affect emotions.

• 多肽，内啡肽指将麻醉传感器联结在一起的任一肽激素群，主要存在大脑中，内啡肽可缓解痛感并影响情绪