Abdomen - Area between the chest and the hips that contains the stomach, small intestine, large intestine, liver, gallbladder, pancreas, and spleen.
Absorption - The way substances pass into tissue as nutrients from food move from the small intestine into the cells of the body.
Abutment teeth - The surrounding teeth of each side of the gap where teeth are missing
Acquired deafness - Loss of hearing that occurs or develops over the course of a lifetime; deafness not present at birth.
Adenocarcinoma - A cancer that develops in the lining or inner surface of an organ.
Agonist - A drug capable of combining with receptors to initiate an action that can be known in advance.
Amenorrhea - Absence or cessation of menstrual periods.
Anal fistula - Channel that develops between the anus and the skin. Most fistulas are the result of an abscess (infection) that spreads to the skin
Anesthesia - Loss of feeling or sensation as a result of drugs or gases. General anesthesia causes loss of consciousness; local or regional anesthesia causes loss of feeling only to a specified area.
Antacids - Medicines that balance acids and gas in the stomach.
Antibiotic - Chemical substances, produced by living organisms or synthesized (created) in laboratories, for the purpose of killing other organisms that cause disease.
Antioxidants - Compounds that protect against cell damage inflicted by molecules called oxygen-free radicals, which are a major cause of disease and aging.
Anus - Opening at the end of the digestive tract where bowel contents leave the body.
Anemia - A condition in which the number of red blood cells is below normal.
Aorta - Blood vessel that delivers oxygen-rich blood from the left ventricle to the body; it is the largest blood vessel in the body.
Artificial ventilation - The process of supporting breathing by manual or mechanical means when normal breathing is inefficient or has stopped
Axon - The long, hair like extension of a nerve cell that carries a message to a nearby nerve cell.