Spiral Valve

spiral valve

[′spī·rəl ¦valv] (vertebrate zoology) A spiral fold of mucous membrane in the small intestine of elasmobranchs and some primitive fishes which increases the surface area for absorption.

Spiral Valve

a fold of mucous membrane in the large intestine of lampreys and certain fishes that is arranged spirally with as many as 40 turns. The spiral valve increases the absorbing surface of the intestine and slows the movement of food through the intestine, thus causing a short straight intestine to resemble a long convoluted one functionally. A spiral valve characterizes sharks, rays, chimaeras, lungfishes, cartilaginous and bony ganoid fishes, and polypteroids.

单词	spiral valve
释义	Spiral Valve spiral valve [′spī·rəl ¦valv] (vertebrate zoology) A spiral fold of mucous membrane in the small intestine of elasmobranchs and some primitive fishes which increases the surface area for absorption. Spiral Valve a fold of mucous membrane in the large intestine of lampreys and certain fishes that is arranged spirally with as many as 40 turns. The spiral valve increases the absorbing surface of the intestine and slows the movement of food through the intestine, thus causing a short straight intestine to resemble a long convoluted one functionally. A spiral valve characterizes sharks, rays, chimaeras, lungfishes, cartilaginous and bony ganoid fishes, and polypteroids. spiral valve spiral valve n. See spiral fold of cystic duct.
随便看	family taccaceae family tachinidae family tachyglossidae family taeniidae family talpidae family tamaricaceae family tang soo do family tapiridae family tarsiidae family taxaceae family tax benefit family tax benefit part a family tax benefit part b family tayassuidae family team decision-making eoui eoun eouq eouro -eous eousa eousa/usao erf eoust eout eoutl