Epithelium

EPITHELIUM By: Khalid Al-Kraida Anatomy Department College of Medicine KSU fundament TO THE CONCEPT OF EPITHELIUM FEATURES OF EPITHELIUM: epithelial tissue lines the surfaces of the clay and is chiefly located on the borders between the impertinent and midland environments. epithelial tissue also lines all the inside proboscis spaces that have a connection with the external environment at some stage. epithelial create from raw stuff is a create from raw stuff composed of cells; tightly-bound to individually opposite, with little intercellular substance. There ar specializations of the cell membranes of epithelial cells that play roles in maintaining the integrity of the tissue. Epithelium is an avascular tissue and has no integral (direct) blood supply. FUNCTIONS OF EPITHELIUM: Owing to the strategical location of epithelium at the border between the internal and external environments, the functions of epithelium are many and varied, but rat be conve niently divided into two major categories:  protecting(prenominal) or metabolic. Protective functions of epithelium complicate protection against: *     robotlike footing *     loss of fluids (desiccation) - waterproofing *     invasion of foreign bodies ( e.g. skin) Metabolic functions of epithelium take on: * Exchange of metabolites, typically described as ion-transport.

All the substances entryway or leaving the body must(prenominal) pass finished epithelium and are under its control. The ion-transporting epithelium may fetch highly narrow down for  absorption or excretion. * The glandular secretions of the body by glands (exocrine and endocrine) are mainly a function of spec! ialized epithelium. Polarity: Epithelial cells are polarized cells and we can distinguish polar areas of the cells ( top(prenominal), basal, and lateral) with specific structural modifications (unlike other tissues, where structural polarity is non found). Specific structures found on the apical surface (the allay surface facing the lumen or external environment) include: microvilli, stereocilia, cilia or...If you want to get a bountiful essay, order it on our website: OrderEssay.net

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