Norepinephrine - A substance, C 8 H 11 NO 3 , both a hormone and neurotransmitter, secreted by the adrenal medulla and the nerve endings of the sympathetic nervous system to cause vasoconstriction and increases in heart rate, blood pressure, and the sugar level of the blood.
Epinephrine- 1. (Biochemistry) - a hormone secreted by the adrenal medulla upon stimulation by the central nervous system in response to stress, as anger or fear, and acting to increase heart rate, blood pressure, cardiac output, and carbohydrate metabolism.
2. (Pharmacology) - a commercial form of this substance, extracted from the adrenal glands of sheep and cattle, or synthesized: used chiefly as a heart stimulant, to constrict the blood vessels, and to relax the bronchi in asthma.
These Beta-blockers treat what? Sectral (acebutolol), Tenormin (atenolol), Kerlone (betaxolol), Coreg (carvedilol), Normodyne, Trandate (labetalol), Lopressor, Toprol XL (metoprolol), Corgard (nadolol), Levatol (penbutolol),