nitrogen (countable and uncountable, plural nitrogens) ( 1 uncountable) A chemical element (symbol N) with an atomic number of 7 and atomic weight of 14.0067. ( 2 uncountable) Molecular nitrogen (N2), a colorless, odorless gas at room temperature.
Your primary care doctor may detect a heart murmur or other signs of heart valve disease. However, a cardiologist usually will diagnose the condition. A cardiologist is a doctor who specializes in diagnosing and treating heart problems. To diagnose heart valve disease, your doctor will ask about your signs and symptoms. He or she also will do a physical exam and look at the results from tests and procedures.
Home Â» Heart valve. Definition. noun, plural: heart valves. (anatomy) Any of the valves of the heart that prevents the back flow of blood through its cusps or flaps of tissues. Supplement. In humans, there are four main valves of the heart: (1) left atrioventricular valve, (2) right atrioventricular valve, (3) aortic valve, and (4) pulmonary valve. The left and right atrioventricular valves are also called mitral valve and tricuspid valve, respectively.