- * * *Movements in a circle, or through a circular course, or through a course that leads back to the same point; usually referring to blood c. unless otherwise specified. [L. circulatio]- assisted c. application of external devices to improve pressure, flow, or both in the heart or arteries.- blood c. the course of the blood from the heart through the arteries, capillaries, and veins back again to the heart.- compensatory c. c. established in dilated collateral vessels when the main vessel of the part is obstructed.- embryonic c. the basic plan of the c. of a young mammalian embryo, at first similar to that in aquatic forms, with an unpartitioned heart and conspicuous aortic arches in the branchial region; as gestation progresses, the arrangement of the major blood vessel s gradually approaches that of an adult, but the routing of blood through the heart, characteristic of an adult, cannot be attained until lung breathing begins at birth.- enterohepatic c. c. of substances such as bile salts which are absorbed from the intestine and carried to the liver, where they are secreted into the bile and again enter the intestine.- extracorporeal c. the c. of blood outside of the body through a machine that temporarily assumes an organ's functions, e.g., through a heart-lung machine or artificial kidney.- fetal c. the c. which serves the fetus in utero, with the placental circuit responsible for supplying oxygen and nutritive material and for eliminating CO2 and nitrogenous wastes. SEE ALSO: embryonic c..- greater c. SYN: systemic c..- lesser c. SYN: pulmonary c..- placental c. the c. of blood through the placenta during intrauterine life, serving the needs of the fetus for aeration, absorption, and excretion; also, maternal c. through the intervillous space of the placenta.- portal c. 1. c. of blood to the liver from the small intestine, the right half of the colon, and the spleen via the portal vein; sometimes specified as the hepatic portal c.; 2. more generally, any part of the systemic c. in which blood draining from the capillary bed of one structure flows through a larger vessel(s) to supply the capillary bed of another structure before returning to the heart; e.g., the hypothalamohypophysial portal system.- portal hypophysial c. a capillary network that carries hypophyseotropic hormones from the hypothalamus, where they are secreted into blood, to their sites of action in the anterior hypophysis. See portal c., pituitary gland, hypothalamus. SYN: hypophyseoportal system, hypophysial portal c., hypophysial portal system, hypophysioportal system, hypothalamohypophysial portal c., hypothalamohypophysial portal system (1).- pulmonary c. the passage of blood from the right ventricle through the pulmonary artery to the lungs and back through the pulmonary veins to the left atrium. SYN: lesser c..- systemic c. the c. of blood through the arteries, capillaries, and veins of the general system, from the left ventricle to the right atrium. SYN: greater c..
* * *cir·cu·la·tion .sər-kyə-'lā-shən n the movement of blood through the vessels of the body that is induced by the pumping action of the heart and serves to distribute nutrients and oxygen to and remove waste products from all parts of the body see PULMONARY CIRCULATION, SYSTEMIC CIRCULATION
* * *cir·cu·la·tion (sur″ku-laґshən) [L. circulatio] 1. movement of something through a circuitous course. 2. the movement of the blood through the heart and blood vessels.
Medical dictionary. 2011.
Look at other dictionaries:
CIRCULATION — L’eau est le constituant majeur des organismes vivants. Les réactions chimiques complexes du métabolisme se déroulent en phase aqueuse et nécessitent des échanges permanents de substances: absorption de composés nutritifs et élimination de… … Encyclopédie Universelle
circulation — cir‧cu‧la‧tion [ˌsɜːkjˈleɪʆn ǁ ˌsɜːr ] noun 1. [uncountable] the exchange of money within an economy: • It was a bold anti inflation plan, including a squeeze on the circulation of money. 2. [uncountable] ECONOMICS if money is in circulation,… … Financial and business terms
Circulation — may refer to: Circulatory system, a biological organ system whose primary function is to move substances to and from cells Circulation (fluid dynamics), the path integral of the fluid velocity around a closed curve Circulation (journal), one of… … Wikipedia
Circulation — Cir cu*la tion, n. [L. circulatio: cf. F. circulation.] 1. The act of moving in a circle, or in a course which brings the moving body to the place where its motion began. [1913 Webster] This continual circulation of human things. Swift. [1913… … The Collaborative International Dictionary of English
circulation — CIRCULATION. s. f. Mouvement de ce qui circule. La circulation du sang. La circulation de la séve dans les plantes. [b]f♛/b] On appelle figurément, La circulation de l argent, Le mouvement de l argent qui passe d une main à l autre, et qui le… … Dictionnaire de l'Académie Française 1798
circulation — Circulation. s. f. Mouvement de ce qui circule. On a depuis quelque temps descouvert la circulation du sang. On dit fig. La circulation de l argent, pour exprimer le mouvement de l argent qui passe d une main à l autre … Dictionnaire de l'Académie française
circulation — (n.) mid 15c., from M.Fr. circulation or directly from L. circulationem (nom. circulatio), noun of action from pp. stem of circulare to form a circle, from circulus small ring (see CIRCLE (Cf. circle)). Used of blood first by William Harvey,… … Etymology dictionary
circulation — [n1] distribution apportionment, currency, dissemination, spread, transmission; concepts 631,651 circulation [n2] moving circularly circling, circuit, circumvolution, current, flow, flowing, gyration, gyre, motion, revolution, rotation, round,… … New thesaurus
Circulation — (v. lat.), Umlauf, so C. des Blutes, s. Blutumlauf; C. des Geldes, s. u. Geld. Circulationsbanken sind so v. w. Zettelbanken (s. Bank). Circulationsmittel (Umlaufsmittel), alles Geld u. alle Werthpapiere, welche anstatt des Geldes im Handel… … Pierer's Universal-Lexikon
circulation — I noun allocation, allotment, branching out, circumagere, diffusion, dispensation, dispensing, dispergere, dispersal, dispersion, dissemination, distribution, divergence, divulgare, emanation, flow, flowing, flux, issuance, motion, movement,… … Law dictionary
circulation — ► NOUN 1) movement to and fro or around something. 2) the continuous motion of blood round the body. 3) the public availability of something. 4) the number of copies sold of a newspaper or magazine. DERIVATIVES circulatory adjective … English terms dictionary