Epithelium

epithelial tissue By: Khalid Al-Kraida Anatomy Department College of Medicine KSU fundament TO THE CONCEPT OF EPITHELIUM FEATURES OF EPITHELIUM: epithelium lines the bulge outs of the clay and is mainly fixed on the castings between the saucy and midland environments. epithelium as well as lines all the internal automobile trunk spaces that have a union with the away environment at some stage. Epithelium is a create from raw wring composed of cells; tightly-bound to separately opposite, with fine intercellular substance. There argon specializations of the cell membranes of epithelial cells that foregather 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 strategic position of epithelium at the border between the internal and external environments, the functions of epithelium are many and varied, but bum be conveniently divided into deuce major categories:  protecting(prenominal) or metabolic. cautionary functions of epithelium complicate shelter against: *     robotlike damage *     loss of fluids (desiccation) - waterproofing *     incursion 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 pass finished epithelium and are under its control. The ion-transporting epithelium may fetch exceedingly narrow down for  concentration or excretion. * The glandular secretions of the body by glands (exocrine and endocrine) are mainly a function of alter epithelium. Polarity: Epithelial cells are diametralized cells and we can distinguish polar areas of the cells (apical, basal, and lateral) with specific structural modifications (unlike other tissues, where structural polarity is non found). limited structures found on the apical surface (the allay surface facing the lumen or external environment) include: microvilli, stereocilia, cilia or...If you trust to get a copious essay, order it on our website: Orderessay

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