[Solved] _____ are thickened areas of the sarcolemma of myocardial cells that enable electrical impulses to travel in a continuous cell-to-cell fashion. A) Sclerotic plaques B) Intercalated disks C) Crossbridges D) A-bands Epinephrine: Also known as adrenaline, a hormone and a neurotransmitter that increases heart rate, muscle strength, blood pressure, and sugar metabolism. Growth Hormone: A substance in humans and other animals that promotes growth, cell reproduction, and the healing of cells. Antidiuretic Hormone: A hormone released by the pituitary gland that helps regulate the balance of water in the body by reducing the amount of water excreted by the kidneys. Kidneys: Vital organs located in the back of the abdomen that filter blood to produce urine, regulate electrolytes, maintain acid-base balance, and regulate blood pressure.