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==In human biology==
===Cardiac===
The collagenous [[cardiac skeleton]] which includes the four [[heart valve]] rings, is histologically, elastically and uniquely bound to cardiac muscle. The [[cardiac skeleton]] also includes the separating [[cardiac septa|septa of the heart chambers]] – the [[interventricular septum]] and the [[atrioventricular septum]]. Collagen contribution to the measure of [[Cardiac stress test|cardiac performance]] summarily represents a continuous torsional force opposed to the [[fluid mechanics]] of blood pressure emitted from the heart. The collagenous structure that divides the upper chambers of the heart from the lower chambers is an impermeable membrane that excludes both blood and electrical impulses through typical physiological means. With support from collagen, [[atrial fibrillation]] never deteriorates to [[ventricular fibrillation]]. Collagen is layered in variable densities with smooth muscle mass. The mass, distribution, age, and density of collagen all contribute to the [[compliance (physiology)|compliance]] required to move blood back and forth. Individual cardiac valvular leaflets are folded into shape by specialized collagen under variable [[pressure]]. Gradual [[calcium]] deposition within collagen occurs as a natural function of aging. Calcified points within collagen matrices show contrast in a moving display of blood and muscle, enabling methods of [[cardiac imaging]] technology to arrive at ratios essentially stating blood in ([[cardiac input]]) and blood out ([[cardiac output]]). Pathology of the collagen underpinning of the heart is understood within the category of [[connective tissue disease]].

Translations:Collagen/7/en - Revision history

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