Template:Aquatic layer topics. An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3000 and 6000 m. Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth âs surface.
Murad discovered in 1977 that nitroglycerin and related artery-widening compounds act by releasing nitric oxide. Furchgott later concluded that cells in the inner lining of blood vessels secrete some unknown substance that makes vessels dilate.
Your blood vessels require the amino acid L-arginine for the synthesis of nitric oxide, since L-arginine is its precursor in your body. By helping to regulate your blood pressure, nitric oxide enhances blood flow. Nitric oxide signals the smooth muscle cells in your blood vessels to relax so that your vessels dilate and your blood flows more freely, which helps your arteries stay free of plaque.