Beta-1 refers to a specific type of beta receptor, which is a protein found on the surface of certain cells in the body. These receptors play a crucial role in the sympathetic nervous system, helping to regulate heart rate, blood pressure, and other vital functions. When activated by hormones like epinephrine (adrenaline), beta-1 receptors stimulate the heart to beat faster and with more force. In the context of pharmacology, drugs that target beta-1 receptors are often used to treat conditions such as heart failure and hypertension. By blocking or stimulating these receptors, medications can help manage heart function and improve overall cardiovascular health.