sinusoid

sinusoid
/suy"neuh soyd'/, n. Math.
a curve described by the equation y = a sin x, the ordinate being proportional to the sine of the abscissa.
[1815-25; SINUS + -OID]

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      irregular tubular space for the passage of blood, taking the place of capillaries and venules in the liver, spleen, and bone marrow. The sinusoids form from branches of the portal vein in the liver and from arterioles (minute arteries) in other organs. The walls of the sinusoids are lined with phagocytic cells, called Kupffer cells (Kupffer cell), that digest old red blood cells and clear the bloodstream of toxins.

      In the liver, blood enters the hepatic sinusoids from both the portal vein (q.v.) and the hepatic artery; the venous blood is cleansed in the sinusoids, while the arterial blood provides oxygen to the surrounding liver cells. Blood then passes from the sinusoids into the hepatic vein for return to the heart.

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Universalium. 2010.

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  • Sinusoid — Si nus*oid, n. [Sinus + oid.] (Geom.) The curve whose ordinates are proportional to the sines of the abscissas, the equation of the curve being y = a sin x. It is also called the {curve of sines}. [1913 Webster] …   The Collaborative International Dictionary of English

  • sinusoid — 1823 in mathematics; 1900 in physiology, from SINUS (Cf. sinus) + OID (Cf. oid). Related: Sinusoidal …   Etymology dictionary

  • sinusoid — [sī′nəs oid΄] n. SINE CURVE sinusoidal adj …   English World dictionary

  • Sinusoid — Ein Sinusoid (Adjektiv sinusoidal) ist eine sinusförmige Funktion, die aus der Sinusfunktion durch Skalierung von Amplitude und Frequenz sowie Phasenverschiebung gebildet wird: . Darin ist A die Skalierung der Amplitude, ω die Skalierung der… …   Deutsch Wikipedia

  • sinusoid — sinusoidė statusas T sritis automatika atitikmenys: angl. sinusoid vok. Sinusoide, f rus. синусоида, f pranc. sinusoïde, f …   Automatikos terminų žodynas

  • sinusoid — sinusoidė statusas T sritis fizika atitikmenys: angl. sine curve; sinusoid vok. Sinuskurve, f; Sinusoide, f rus. синусоида, f pranc. courbe sinusoïdale, f; sinusoïde, f …   Fizikos terminų žodynas

  • Sinusoid (Blutgefäß) — Sinusoid der Leber einer Ratte mit fenestrierten Endothelzellen. Der Durchmesser der Fenestrae ist ca 100 nm, und der der Sinusoide ca. 5 µm. Rasterelektronenmikroskopische Aufnahme von Robin Fraser, University of Otago. Ein Sinusoid ist ein… …   Deutsch Wikipedia

  • Sinusoid (blood vessel) — A sinusoid is a small blood vessel similar to a capillary but with a discontinuous endothelium.Sinusoids are found in the liver, lymphoid tissue, endocrine organs, and hematopoietic organs such as the bone marrow and the spleen. Sinusoids found… …   Wikipedia

  • sinusoid — noun Etymology: Medieval Latin sinus sine Date: 1823 1. sine curve, sine wave 2. [New Latin sinus] a minute endothelium lined space or passage for blood in the tissues of an organ (as the liver) …   New Collegiate Dictionary

  • sinusoid — 1. noun a) A sine curve. b) Any of several channels through which venous blood passes in various organs. 2. adjective a) sinusoidal. b) That resembles a …   Wiktionary

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