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secretion

secretion
1. The manufacture and discharge of specific substances into the external medium by cells in living organisms. (The substance secreted is also called the secretion.) Secretory cells are often specialized and organized in groups to form glands. The substances produced may be released directly into the blood (endocrine secretion; see endocrine gland) or through a duct (exocrine secretion; see exocrine gland). Secretions can be classified according to the manner of their discharge. Merocrine (eccrine) secretion occurs without the secretory cells sustaining any permanent change; in apocrine secretion the cells release a secretory vesicle incorporating part of the secretory cell membrane; and holocrine secretion involves the disruption of the entire cell to release its accumulated secretory vesicles. Substances destined for secretion are prepared and packaged into membranous vesicles by the Golgi apparatus inside the cell.

2. The process by which a substance is pumped out of a cell against a concentration gradient. Secretion has an important role in adjusting the composition of urine as it passes through the nephrons of the kidney.

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"secretion." A Dictionary of Biology. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"secretion." A Dictionary of Biology. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/secretion-1

"secretion." A Dictionary of Biology. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/secretion-1

secretion

secretion, in biology, substance elaborated by the living material of an animal or plant. Secretions in humans can be produced by a single cell or by a group of cells commonly called a gland. Some secretions perform special functions in the body (true secretions); others are eliminated as waste products (excretions). Digestive secretions include saliva, gastric juice, intestinal juice, pancreatic juice, and bile. Certain secretions serve as lubricants, e.g., the synovial fluid in joints or the secretions from mucous membranes and from the lachrymal (tear) glands. The mammary glands secrete milk. The endocrine (ductless) glands secrete hormones that enter directly into the bloodstream (see gland). Among the excretions from the body are urine (from the kidneys), perspiration (from the sweat glands), and bile pigments (from the gall bladder). Plant secretions include nectar and various enzymes concerned with the digestion of nutrients within the plant cells.

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"secretion." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"secretion." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/secretion

"secretion." The Columbia Encyclopedia, 6th ed.. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/secretion

secretion

secretion describes the processes by which cells assemble materials and release them for action elsewhere. Commonly material is passed into a duct (exocrine secretion). For example, saliva, containing salts and enzymes, is assembled in the salivary gland cells, released into salivary ducts, and passed to the mouth to help with mastication and digestion. Other secretions are passed directly into the bloodstream (endocrine secretion). Generally the word is not used to describe how neurotransmitters or neurohormones are lost from cells; rather these are said to be released. Finally, secretion should not be confused with excretion, which refers to the loss of waste products from the body.

Alan W. Cuthbert

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"secretion." The Oxford Companion to the Body. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

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"secretion." The Oxford Companion to the Body. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/medicine/encyclopedias-almanacs-transcripts-and-maps/secretion

secretion

se·cre·tion / siˈkrēshən/ • n. a process by which substances are produced and discharged from a cell, gland, or organ for a particular function in the organism or for excretion. ∎  a substance discharged in such a way.

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"secretion." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"secretion." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/secretion-0

"secretion." The Oxford Pocket Dictionary of Current English. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/secretion-0

secretion

secretion (si-kree-shŏn) n.
1. the process by which a gland isolates constituents of the blood or tissue fluid and chemically alters them to produce a substance that it discharges for use by the body or excretes.

2. the substance that is produced by a gland.

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"secretion." A Dictionary of Nursing. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

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"secretion." A Dictionary of Nursing. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/secretion

secretion

secretion Production and discharge of a substance, usually a fluid, by a cell or a gland. The substance so discharged is also known as a secretion. Secretions include enzymes, hormones, saliva, and sweat.

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"secretion." World Encyclopedia. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"secretion." World Encyclopedia. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/secretion

"secretion." World Encyclopedia. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/secretion

secretion

secretion
1. The act of discharging useful materials (i.e. as opposed to the excretion of waste products) from cells.

2. Any such material discharged from cells.

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"secretion." A Dictionary of Zoology. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

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"secretion." A Dictionary of Zoology. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/secretion-0

secretion

secretion
1. The act of discharging materials from cells.

2. Any material discharged from cells.

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"secretion." A Dictionary of Plant Sciences. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

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"secretion." A Dictionary of Plant Sciences. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/secretion

secretion

secretionashen, fashion, passion, ration •abstraction, action, attraction, benefaction, compaction, contraction, counteraction, diffraction, enaction, exaction, extraction, faction, fraction, interaction, liquefaction, malefaction, petrifaction, proaction, protraction, putrefaction, redaction, retroaction, satisfaction, stupefaction, subtraction, traction, transaction, tumefaction, vitrifaction •expansion, mansion, scansion, stanchion •sanction •caption, contraption •harshen, Martian •cession, discretion, freshen, session •abjection, affection, circumspection, collection, complexion, confection, connection, convection, correction, defection, deflection, dejection, detection, direction, ejection, election, erection, genuflection, imperfection, infection, inflection, injection, inspection, insurrection, interconnection, interjection, intersection, introspection, lection, misdirection, objection, perfection, predilection, projection, protection, refection, reflection, rejection, resurrection, retrospection, section, selection, subjection, transection, vivisection •exemption, pre-emption, redemption •abstention, apprehension, ascension, attention, circumvention, comprehension, condescension, contention, contravention, convention, declension, detention, dimension, dissension, extension, gentian, hypertension, hypotension, intention, intervention, invention, mention, misapprehension, obtention, pension, prehension, prevention, recension, retention, subvention, supervention, suspension, tension •conception, contraception, deception, exception, inception, interception, misconception, perception, reception •Übermenschen • subsection •ablation, aeration, agnation, Alsatian, Amerasian, Asian, aviation, cetacean, citation, conation, creation, Croatian, crustacean, curation, Dalmatian, delation, dilation, donation, duration, elation, fixation, Galatian, gyration, Haitian, halation, Horatian, ideation, illation, lavation, legation, libation, location, lunation, mutation, natation, nation, negation, notation, nutation, oblation, oration, ovation, potation, relation, rogation, rotation, Sarmatian, sedation, Serbo-Croatian, station, taxation, Thracian, vacation, vexation, vocation, zonation •accretion, Capetian, completion, concretion, deletion, depletion, Diocletian, excretion, Grecian, Helvetian, repletion, Rhodesian, secretion, suppletion, Tahitian, venetian •academician, addition, aesthetician (US esthetician), ambition, audition, beautician, clinician, coition, cosmetician, diagnostician, dialectician, dietitian, Domitian, edition, electrician, emission, fission, fruition, Hermitian, ignition, linguistician, logician, magician, mathematician, Mauritian, mechanician, metaphysician, mission, monition, mortician, munition, musician, obstetrician, omission, optician, paediatrician (US pediatrician), patrician, petition, Phoenician, physician, politician, position, rhetorician, sedition, statistician, suspicion, tactician, technician, theoretician, Titian, tuition, volition •addiction, affliction, benediction, constriction, conviction, crucifixion, depiction, dereliction, diction, eviction, fiction, friction, infliction, interdiction, jurisdiction, malediction, restriction, transfixion, valediction •distinction, extinction, intinction •ascription, circumscription, conscription, decryption, description, Egyptian, encryption, inscription, misdescription, prescription, subscription, superscription, transcription •proscription •concoction, decoction •adoption, option •abortion, apportion, caution, contortion, distortion, extortion, portion, proportion, retortion, torsion •auction •absorption, sorption •commotion, devotion, emotion, groschen, Laotian, locomotion, lotion, motion, notion, Nova Scotian, ocean, potion, promotion •ablution, absolution, allocution, attribution, circumlocution, circumvolution, Confucian, constitution, contribution, convolution, counter-revolution, destitution, dilution, diminution, distribution, electrocution, elocution, evolution, execution, institution, interlocution, irresolution, Lilliputian, locution, perlocution, persecution, pollution, prosecution, prostitution, restitution, retribution, Rosicrucian, solution, substitution, volution •cushion • resumption • München •pincushion •Belorussian, Prussian, Russian •abduction, conduction, construction, deduction, destruction, eduction, effluxion, induction, instruction, introduction, misconstruction, obstruction, production, reduction, ruction, seduction, suction, underproduction •avulsion, compulsion, convulsion, emulsion, expulsion, impulsion, propulsion, repulsion, revulsion •assumption, consumption, gumption, presumption •luncheon, scuncheon, truncheon •compunction, conjunction, dysfunction, expunction, function, junction, malfunction, multifunction, unction •abruption, corruption, disruption, eruption, interruption •T-junction • liposuction •animadversion, aspersion, assertion, aversion, Cistercian, coercion, conversion, desertion, disconcertion, dispersion, diversion, emersion, excursion, exertion, extroversion, immersion, incursion, insertion, interspersion, introversion, Persian, perversion, submersion, subversion, tertian, version •excerption

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"secretion." Oxford Dictionary of Rhymes. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

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"secretion." Oxford Dictionary of Rhymes. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/secretion