Tissues.pdf - Tissues Introduction • Cells are the building...

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TissuesIntroductionCellsare the building blocks of life and the all-inclusive functional units of unicellular organisms.In multicellular organisms, cells depend on one another and cooperate to maintainhomeostasisin the body.A division of laborexists, with certain groups of cells highly specialized to perform functions that benefit the organism.Cell specializationcan be risky because when a small specific group of cells is indispensable, any inability to function on its part can paralyze or destroy the entire body.Ex. CancerTissues: Groups of cells that are similarin structure and function.Primary Tissue Types:Epithelial Tissue (Epithelium)Connective TissueNervous TissueMuscle TissueHave distinctive structures, patterns, and functions!To perform specific body functions, the tissues are organized into organs.Heart, Kidneys, Lungs…Most organs contain several representatives of the primary tissues, and the arrangement of the tissues determines the organ’s structure and function!Histology: the study of tissues.Epithelial TissueEpithelial Tissue/ Epithelium: is a sheet of cells that covers a body surface or lines a body cavity.Occurs in the body as:Covering and Lining EpitheliumForms the outer layer of the skin and lines body cavities that open to the outside.Covers the walls and organs of the closed ventral body cavity.Glandular epitheliumBecause glands develop from epithelial sheets.Epithelial Tissue FunctionsProtectionAbsorptionFiltrationExcretionSecretionSensory ReceptionExamples:Covering the body surface protection against bacterial invasion and chemical damage.Lining the respiratory tract ciliated to sweep dust and other foreign particles away from the lungs.Specialized to absorb substances lines the stomach and intestines.

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