The adrenal glands produce adrenaline, also known as epinephrine. These two small, triangular-shaped glands sit atop each kidney and play crucial roles in the body’s response to stress. When the body perceives a threat, the adrenal glands release adrenaline into the bloodstream, preparing the body for a "fight or flight" response. This hormone increases heart rate, enhances energy production, and dilates air passages, allowing for more oxygen intake. Adrenaline's effects are vital in emergency situations, helping individuals respond rapidly to potential dangers. The adrenal glands also produce other hormones that regulate metabolism, immune response, and stress management.