Beta-3 refers to a type of adrenergic receptor that is part of the body's sympathetic nervous system. These receptors are involved in various physiological processes, including the regulation of fat metabolism and the relaxation of bladder muscles. They play a role in how the body responds to stress and can influence energy expenditure. Research into beta-3 receptors has potential implications for treating conditions like obesity and overactive bladder. By targeting these receptors, scientists hope to develop new medications that can help manage weight and improve bladder control, offering alternatives to existing treatments.