Sinusoid

sinusoid

[′sī·nə‚sȯid] (anatomy) Any of the relatively large spaces comprising part of the venous circulation in certain organs, such as the liver. (mathematics) sine curve

Sinusoid

(or sine curve), the graph of the function y = sin x. It is a plane curve (see Figure 1) representing the variation in the sine as the argument, or angle, changes. A sinusoid intersects the x-axis at the points 180°k (or πk) and has maxima at the points 90° + 360°k (or π/2 + 2-πk) and minima at the points - 90° + 360°k (or - π/2 + 2πk), where k = 0, ± 1.....

Figure 1

The curve defined by the equation y = A sin (ωx + Φ₀) is also sometimes called a sinusoid. The relation between this curve and the curve y = sin x is as follows: first, the x-coordinates of the points of y = sin x are increased by a factor of ω; second, the y-coordinates of the points of y = sin x are increased by a factor of A; and third, the curve is translated by an amount - Φ₀/ω along the x-axis. The number A is called the amplitude, ω is called the angular frequency, and Φ/₀ is called the initial phase angle. The sinusoid is of great importance in the theory of oscillations. [23–1296–]

sinusoid

[si´nŭ-soid] 1. resembling a sinus.2. a form of terminal blood channel consisting of a large, irregular, anastomosing vessel, having a lining of reticuloendothelium but little or no adventitia. Sinusoids are found in the liver, adrenal glands, heart, parathyroid glands, carotid bodies, spleen, hemolymph glands, and pancreas.

si·nu·soid

(si'nŭ-soyd), 1. Resembling a sinus. 2. Sinusoidal capillary; a thin-walled terminal blood vessel having an irregular and larger caliber than an ordinary capillary; its endothelial cells have large gaps and the basal lamina is either discontinuous or absent. Synonym(s): vas sinusoideum [TA], sinusoidal capillary [sinus + G. eidos, resemblance]

sinusoid

(sī′nə-soid′, -nyə-)n.1. Mathematics See sine curve.2. Anatomy Any of the venous cavities through which blood passes in various glands and organs, such as the adrenal gland and the liver.

si′nu·soi′dal (-soid′l) adj.si′nu·soi′dal·ly adv.

si·nu·soid

(sī'nŭ-soyd) 1. Resembling a sinus. 2. Sinusoidal capillary; a thin-walled terminal blood vessel having a more variable and larger caliber than an ordinary capillary; its endothelial cells have large gaps and the basal lamina is either discontinuous or absent. [sinus + G. eidos, resemblance]

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Synonyms for sinusoid

noun tiny endothelium-lined passages for blood in the tissue of an organ

Related Words

noun the curve of y=sin x

Synonyms

Related Words