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hypersensitivity
(Encyclopedia)hypersensitivity, heightened response in a body tissue to an antigen or foreign substance. The body normally responds to an antigen by producing specific antibodies against it. The antibodies impart i...cholesterol
(Encyclopedia)CE5 cholesterol kəlĕsˈtərōlˌ [key], fatty lipid found in the body tissues and blood plasma of vertebrates; it is only sparingly soluble in water, but much more soluble in some organic solvent...track and field athletics
(Encyclopedia)track and field athletics or athletics, sports of foot racing, hurdling, jumping, vaulting, and throwing varied weights and objects. They are usually separated into two categories: track, the running ...endocrine system
(Encyclopedia)endocrine system ĕnˈdəkrĭn [key], body control system composed of a group of glands that maintain a stable internal environment by producing chemical regulatory substances called hormones. The end...hormone
(Encyclopedia)hormone, secretory substance carried from one gland or organ of the body via the bloodstream to more or less specific tissues, where it exerts some influence upon the metabolism of the target tissue. ...drug addiction and drug abuse
(Encyclopedia)drug addiction and drug abuse, chronic or habitual use of any chemical substance to alter states of body or mind for other than medically warranted purposes. Traditional definitions of addiction, with...baseball
(Encyclopedia)CE5 A regulation baseball field. Minimum distance to the outfield fence is 250 ft; professional baseball fields constructed since 1958 have been at least 325 ft deep along the foul lines and 400 ft...vitamin
(Encyclopedia)vitamin, group of organic substances that are required in the diet of humans and animals for normal growth, maintenance of life, and normal reproduction. Vitamins act as catalysts; very often either t...Browse by Subject
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