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  Section: Zoological Terms used in General Zoology
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F - Zoological Terms

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facilitated diffusion

Mediated transport in which a permease makes possible diffusion of a molecule across a cell membrane in the direction of a concentration gradient; contrast with active transport.


Abbreviation for flavine adenine dinucleotide, an electron acceptor in the respiratory chain.


(L. fasciculus, small bundle). A small bundle, usually referring to a collection of muscle fibers or nerve axons.

fatty acid

Any of a series of saturated organic acids having the general formula CnH2nO2, occurs in natural fats of animals and plants.


(L. fermentum, ferment). Enzymatic transformation, without oxygen, or organic substrates, especially carbohydrates, yielding products such as alcohols, acids, and carbon dioxide.


(L. fibra, thread). A fiberlike cell or strand of protoplasmic material produced or secreted by a cell and lying outside the cell.


(L. fibra, thread). A strand of protoplasm produced by a cell and lying within the cell.


(L. fibrilla, small fiber). Composed of or pertaining to fibrils or fibers.


Protein that forms a meshwork, trapping erythrocytes, to become blood clot. Precursor is fibrinogen.


Deposition of fibrous connective tissue in a localized site, during process of tissue repair or to wall off a source of antigen.


(L. filum, thread, + Gr. pous, podos, a foot). A type of pseudopodium that is very slender and may branch but does not rejoin to form a mesh.

filter feeding

Any feeding process by which particulate food is filtered from water in which it is suspended.


(L. fissio, a splitting). Asexual reproduction by a division of the body into two or more parts.


Degree of adjustment and suitability for a particular environment. Genetic fitness is relative contribution to one genetically distinct organism to the next generation; organisms with high genetic fitness are naturally selected and become prevalent in a population.


pl. flagella (L. a whip). Whiplike organelle of locomotion.

flame cell

Specialized hollow excretory or osmoregulatory structure of one or several small cells containing a tuft of flagella (the “flame”) and situated at the end of a minute tubule; connected tubules ultimately open to the outside. See solenocyte, protonephridium.


(O.E. floc, flatfish). A member of class Trematoda or class Monogenea. Also, certain of the flatfishes (order Pleuronectiformes).


Abbreviation for flavin mononucleotide, the prosthetic group of a protein (flavoprotein) and a carrier in the electron transport chain in respiration.

food vacuole

A digestive organelle in the cell.


(L. foramin, hole, performation, + fero, to bear). A member of the class Granuloreticulosea (phylum Sarcomastigophora) bearing a test with many openings.


Any remains or impression of an organism from a past geological age that has been preserved by natural processes, usually by mineralization in the earth’s crust.


Characterized by digging or burrowing.


Contamination of feeding or respiratory areas of an organism by excrement, sediment, or other matter. Also, accumulation of sessile marine organisms on the hull of a boat or ship so as to impede its progress through the water.


event Establishment of a new population by a small number of individuals (sometimes a single female carrying fertile eggs) that disperse from their parental population to a new location geographically isolated from the parental population.


(L. small pit). A small pit or depression; especially the fovea centralis, a small rodless pit in the retina of some vertebrates, a point of acute vision.

free energy

The energy available for doing work in a chemical system.

frontal plane

A plane parallel to the main axis of the body and at right angles to the sagittal plane.


(L. fusus, spindle, + forma, shape). Spindle shaped; tapering toward each end.

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