fa·tigue (fe-têg¹) noun
1. Physical or mental weariness resulting from exertion.
2. Something, such as tiring effort or activity, that causes weariness.
3. The decreased capacity or complete inability of an organism, an organ, or a part
to function normally because of excessive stimulation or prolonged exertion.
4. The weakening or failure of a organism, resulting from prolonged stress.1
[French, from Old French, from fatiguer, to fatigue, from Latin fatìgâre.]
- FDA Approval
- FDA (abbreviation) An approval rating from the Food and Drug
- Food and Drug Administration
- Food and Drug Administration (FDA) agency in the Public Health
Service division of the U.S. Dept. of Health and Human Services. Established in 1928, it
is charged with protecting public health by ensuring that foods are safe and pure,
cosmetics and other chemical substances harmless, and products safe, effective, and
honestly labeled. All new medicinal drugs must be licensed for use by the FDA. 1
- Free Radical
- free radical noun
- 1. An atom or group of atoms having at least one unpaired
electron, which makes it highly reactive.
- 2. An organic compound in which some of the valence electrons are
unpaired, occurring as a normal byproduct of oxidation reactions in metabolism 1
- glucose, (gl¡¹kos´) (empirical formula: C6H12O6), Glucose is
the major source of energy in human and animal metabolism. It requires no digestion prior
to absorption into the bloodstream. A monosaccharide (see CARBOHYDRATE), glucose can be obtained by HYDROLYSIS
of a variety of more complex carbohydrates, e.g., MALTOSE, CELLULOSE, or GLYCOGEN. 2
- glycogen (glì¹ke-jen), highly branched POLYMER of GLUCOSE that
is made and stored in the LIVER and MUSCLE cells of humans and the higher animals and in
the cells of lower animals. During short periods of strenuous activity, energy is released
in the muscles by direct conversion of glycogen to lactic acid. See also CARBOHYDRATE. 1
- gly·co·gen (glì¹ke-jen) noun A polysaccharide,
(C6H10O5)n, that is the main form of carbohydrate storage in animals and occurs primarily
in the liver and muscle tissue. It is readily converted to glucose as needed by the body
to satisfy its energy needs. Also called animal starch. gly´co·gen¹ic
(-jèn¹îk) adjective 2
- glycolysis, process in all higher animals and most microorganisms
in which glucose is broken down. Beginning with a single molecule of glucose, glycolysis
is a series of chemical reactions requiring eleven different ENZYMES and eventually
yielding two molecules of lactic acid, which then enter the CITRIC ACID CYCLE. The
reactions of glycolysis also generate the high-energy substance ADENOSINE TRIPHOSPHATE.
Glycolysis is the primary means by which many anaerobic organisms obtain energy. 1