What is a key function of endorphins in the human body?

Endorphins are neuropeptides produced by the central nervous system and the pituitary gland that play a significant role in pain management and the body's response to stress. One of their primary functions is to act as natural pain relievers, which is why they are often referred to as the body's "natural morphine." When the body experiences pain or stress, endorphins are released to bind to the opioid receptors in the brain, diminishing the perception of pain and creating a sense of well-being. This mechanism not only helps in alleviating discomfort but also contributes to a feeling of happiness or euphoria, often referred to as the "runner's high" experienced during intense physical activity.

While endorphins might indirectly contribute to relaxation as a secondary effect after pain relief, their fundamental role is centered around their pain-relieving properties. Other functions such as regulating heartbeat or speeding up metabolism are not directly associated with endorphins; those processes involve different biochemical factors and hormones within the body. Thus, the correct understanding of endorphins emphasizes their significant role in pain management, supporting the selection of acting as pain relievers as the key function.