Beta-2 receptors are a type of protein found on the surface of certain cells in the body. They belong to the adrenergic receptor family and primarily respond to hormones like epinephrine and norepinephrine. When activated, these receptors play a crucial role in various physiological processes, including the relaxation of smooth muscles in the airways, which helps improve breathing. These receptors are particularly important in the treatment of conditions such as asthma and chronic obstructive pulmonary disease (COPD). Medications known as beta-2 agonists stimulate these receptors, leading to bronchodilation and easier airflow. This makes them essential for managing respiratory issues effectively.