St._John's_University_Human_Anatomy_and_Physiology_I_BIO_3301L_Laboratory_Tissue_Level_of_Organizati

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St. John’s UniversityDr. Emanuel J. PepitoneBIO 3301L: Human Anatomy and Physiology I LaboratoryTissue Level of OrganizationEpithelial Tissue#TissueDescriptionLocationFunction1.SimpleSquamousEpitheliumSingle layer of flat, scale-likecells, resembles a fried egg;single centrally locatednucleusEndothelium:linesheart, blood vesselsMesothelium:linesthoracic, abdominopleviccavitiesAlveoli:air sacs in lungsDiffusion (lungs)Filtration (kidneys)ProtectionSecreteslubricatingsubstancesAbsorption2.SimpleCuboidalEpitheliumSingle layer of cube shapedcells; single centrally locatednucleusGonads:ovaries andtestesKidney tubulesDucts of glands: thyroid,salivary, pancreasSecretionAbsorption3.SimpleColumnarEpitheliumSingle layer of tall columnshaped or rectangular cells;nucleus positioned close tothe basal lamina of basementmembraneGoblet cells:producepre-mucin for lubricationand protectionLine GI and respiratorytracts; glands and theirducts of the GI tractNon-ciliated:microvilliincrease surface area forabsorptionCiliated:cilia providemovement of fluids orparticles along a surface4.StratifiedSquamous:KeratinizedEpitheliumSeveral layers of cells: apicallayer squamous cells, basallayer: cuboidal and/orcolumnarLining of mouth, analcanal, esophagus, vaginaApical layer ofepidermis: proteinaceouskeratinSoftens and moistens apicalsurfaceProtection from abrasionRepels water and bacteria5.StratifiedCuboidalEpitheliumTwo or more layers of cubeshaped cellsRare distributionLines large ducts ofseminiferous tubulesFollicular cells of ovaProtection6.StratifiedColumnarEpitheliumTwo or more layers of tallcolumn shaped orrectangular cellsRare distributionLines large ducts ofglands (duodenum)SecretionProtection7.CiliatedPseudostratifiedColumnarEpitheliumAppears to have several celllayers; nuclei located atvarious levels, all cells reston basal lamina but not allcontact the apical surface;have cilia or goblet cells atapical layerNasal cavityTracheaOviductsCilia sweep away mucousthat has trapped foreignmaterialSecretion8.

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Term
Fall
Professor
FeliciaCarvalho
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