What is the primary function of endorphins?

Endorphins are primarily recognized for their role in reducing pain and promoting feelings of pleasure and well-being. They are natural chemicals produced by the body, often referred to as "endogenous morphines," because they act in a similar way to opioids. When endorphins are released, they bind to the body's opioid receptors, effectively blocking the transmission of pain signals and enhancing the sensation of pleasure, which can lead to feelings of euphoria or a "runner's high" during physical activities.

This function is vital in various situations, such as during exercise, stress, or injury, as it helps individuals cope with physical discomfort. The release of endorphins is also linked to emotional responses, contributing to overall feelings of happiness and satisfaction. Consequently, option B accurately captures the essence of what endorphins primarily do in the context of psychology and physiology.