Final answer:
Endorphins are produced in situations that involve fear, stress, or injury. These situations can trigger the release of endorphins, which play a major role in the body's inhibitory response to pain.
Step-by-step explanation:
Endorphins are produced in situations that involve fear, stress, or injury. These situations can trigger the release of endorphins, which play a major role in the body's inhibitory response to pain. For example, during vigorous aerobic exercise, the release of β-endorphins can contribute to the phenomenon known as a 'runner's high'. Additionally, endorphins may contribute to the positive effect of exercise on anxiety and depression.