facet (fas'et) A small, flattened surface of a bone. p. 214 facilitated diffusion (fah-sil'i-tat'id di-

fu'zhun) Diffusion in which substances move through membranes from a region of higher concentration to a region of lower concentration by carrier molecules. p. 84 facilitation (fah-sil"i-ta'shun) The hastening of any natural process, increasing efficiency of the natural process. p. 902 fallopian tube (fah-lo'pe-an tub) Tube that transports an egg cell from the region of the ovary to the uterus; oviduct or uterine tube. p. 902

fascia (fash'e-ah) A sheet of fibrous connective tissue that encloses a muscle. p. 298

fasciculus (fah-sik'u-lus) A small bundle of muscle fibers. p. 298 fat (fat) Adipose tissue; or an organic substance whose molecules contain glycerol and fatty acids. p. 50 fatty acid (fat'e as'id) A building block of a fat molecule. p. 51

fatty acid oxidase (fat'e as'id ok'si-days") An enzyme that catalyzes the removal of hydrogen or electrons from a fatty acid molecule. p. 741 feces (fe'sez) Material expelled from the digestive tract during defecation. p. 726 femoral (fem'or-al) Pertaining to the thigh. p. 24

ferritin (fer'i-tin) An iron-protein complex that stores iron in liver cells. p. 551 fertilization (fer"ti-li-za'shun) The union of an egg cell and a sperm cell. p. 912 fetus (fe'tus) A human embryo after eight weeks of development. p. 954 fever (fe'ver) Elevation of body temperature above normal. p. 660 fibrillation (fi"brl-la'shun) Uncoordinated contraction of muscle fibers. p. 600 fibrin (fi'brin) Insoluble, fibrous protein formed from fibrinogen during blood coagulation. p. 564 fibrinogen (fi-brin'o-jen) Plasma protein converted into fibrin during blood coagulation. p. 560 fibrinolysin (fi"bri-nori-sin) A proteinsplitting enzyme that can digest fibrin in a blood clot. p. 565 fibroblast (fi'bro-blast) Cell that produces fibers and other intercellular materials in connective tissues. p. 151 fibrocartilage (fi"bro-kar'ti-lij) Strongest and most durable cartilage; made up of cartilage cells and many collagenous fibers. p. 156 fibrous joint (fi'brus joint) Two or more bones joined by connective tissue containing many fibers. p. 271 filtration (fil-tra'shun) Movement of material through a membrane as a result of hydrostatic pressure. p. 87 filtration pressure (fil-tra'shun presh'ur) Equal to the hydrostatic pressure of the blood entering the glomerulus minus the pressure of the opposing forces (the hydrostatic pressure within the glomerular capsule and the plasma osmotic pressure of the blood in the glomerulus). p. 833 fissure (fish'ur) A narrow cleft separating parts, such as the lobes of the cerebrum. p. 412

flaccid paralysis (flak'sid pah-ral'i-sis) Total loss of muscle tone when nerve fibers are damaged. p. 411 flagella (flah-jel'ah) Relatively long, motile processes that extend from the surface of a cell. p. 78

flexion (flek'shun) Bending at a joint to decrease the angle between bones. p. 276 folacin (fol'ah-sm) Vitamin that is part of the B complex group necessary for normal cellular synthetic processes; folic acid. p. 756 follicle (fol'i-kl) A pouchlike depression or cavity. p. 901 follicle-stimulating hormone (fol'i-kl stim'u-la"ting hor'moin) A substance secreted by the anterior pituitary gland that stimulates development of an ovarian follicle in a female or production of sperm cells in a male; FSH. p. 518

follicular cells (fo-lik'u-lar selz) Ovarian cells that surround a developing egg cell and secrete female sex hormones. p. 901 fontanel (fon"tah-nel') Membranous region between certain cranial bones in the skull of a fetus or infant. p. 222 food pyramid (food peir'ah-mid) A triangular structure divided into sections representing different types and quantities of nutrients required by the body. p. 766 foramen (fo-ra'men) An opening, usually in a bone or membrane (pl., foramina). p. 214 foramen magnum (fo-ra'men mag'num)

Opening in the occipital bone of the skull through which the spinal cord passes. p. 216

foramen ovale (fo-ra'men o-val'e) Opening in the interatrial septum of the fetal heart. p. 961

forebrain (foreran) The anteriormost portion of the developing brain that gives rise to the cerebrum and basal ganglia. p. 411 formula (foir'mu-lah) A group of symbols and numbers used to express the composition of a compound. p. 41 fossa (fos'ah) A depression in a bone or other part. p. 214 fovea (fo've-ah) A tiny pit or depression. p. 214

fovea centralis (fo've-ah sen-tral'is) Region of the retina, consisting of densely packed cones, that provides the greatest visual acuity. p. 487 fracture (frak'chur) A break in a bone. p. 206 free radical (frei rad'eh-kel) Highly reactive by-product of metabolism that can damage tissue. p. 970 frenulum (fren'u-lum) A fold of tissue that anchors and limits movement of a body part. p. 691

frontal (frun'tal) Pertaining to the forehead. p. 24

FSH Follicle-stimulating hormone. p. 518 functional syncytium (funk'shun-al sin-sish'e-um) Merging cells performing together as a unit; those of the heart are joined electrically. A syncytium lacks cell boundaries, appearing as a multinucleated structure. p. 595

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