exotropia
exotropia Divergent gaze. Also known as external strabismus and, pejoratively, walleye.
exotropia Divergent gaze. Also known as external strabismus and, pejoratively, walleye.
exophthalmos A condition in which the patient has protruding eyeballs, as in Graves disease.
exonuclease An enzyme that cleaves nucleotide bases sequentially from the free ends of a nucleic acid (DNA or RNA).
exon A region of DNA in a gene that is transcribed (read) into mature messenger RNA. An exon is the protein-coding part of a gene. See also intron.
exogenous Originating from outside an organism. For example, insulin taken by a diabetic is exogenous insulin. See also endogenous.
exocrine Pertaining to the secretion of a substance out of the body through a duct. The exocrine glands include the salivary glands, sweat glands, and glands within the gastrointestinal tract. Exocrine is as opposed to endocrine, which refers to the secretion of a substance (a hormone) within the body through the bloodstream. See also endocrine.
exfoliate 1 To peel off scaly skin spontaneously. For example, the skin exfoliates from the palms and soles in psoriasis, Kawasaki disease, and Reiter syndrome. 2 To deliberately wear away the top layer of skin, as may be done gently by a facial technologist who is applying a topical skin treatment for cosmetic purposes or…
exercise-induced bronchospasm See asthma, exercise-induced.
exercise-induced asthma See asthma, exercise-induced.
exercise treadmill A machine used to obtain a continuous electrocardiogram recording of the heart as a patient performs increasing levels of exercise. An exercise treadmill permits the detection of abnormal heart rhythms (arrhythmias) and provides a screening test for the presence of narrowed arteries to the heart (coronary arteries). Narrowing of these arteries can limit…
exercise, aerobic See aerobic exercise.
excrescence An abnormal outgrowth as, for example, a wart.