Exercise 5 (Histology) - Lab Exercise 5 Epithelial and Connective Tissues Portland Community College BI 231 Tissues Groups of cells similar in structure

Exercise 5 (Histology) - Lab Exercise 5 Epithelial and...

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Lab Exercise 5Epithelial and Connective TissuesPortland Community CollegeBI 231
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2TissuesGroups of cells similar in structure and functionEach tissue is then further subdivided into categories.All organs are made of a combination of different tissues.The four types of tissuesEpithelialConnectiveMuscleNerve
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EpitheliumCovers all body surfaces, inside and outIs anchored to connective tissue by a layer of glycoproteins and protein fibers called the basal lamina3
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4Epithelial TissueDistinguishing Characteristics1.Cellularity: Composed almost entirely of cells2.Polarity: apical and basal surfaces (top and a bottom)3.Attachment: Supported by connective tissue (basement membrane)4.Avascular: Contains no blood vessels: obtains nutrients by diffusion 5.Regeneration: Rapidly replaces lost cells by cell division
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Functions of EpitheliaProtection:SkinSecretion:glands release secretionsAbsorption:Uptake nutrientsSensory:Taste budsFiltration:In the kidneys5
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6Classification of Epithelia1.First name:Simple: one layerStratified: more than one layer2.Second name:Based on the shape of the top layer of cellsSquamous (flat)Cuboidal (square)Columnar (rectangle)3.Two additional categoriesTransitionalPseudostratified
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7Classification of Epithelia
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8Classification of EpitheliaSquamousCuboidalColumnar
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9Simple Squamous EpitheliumSingle layer of flattened cells with disc-shaped nuclei and sparse cytoplasm
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10Simple Squamous EpitheliumTop View
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11
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12Simple Squamous Epithelium
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13Simple Squamous EpitheliumFunctions:1.DiffusionAlveoli in the respiratory system allows for exchange of O2and CO22.FiltrationCapillaries allow fluid and other substances out and holds blood cells and proteins in3.LubricationSecretes lubricating substances in serosae
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14Simple Cuboidal EpitheliumSingle layer of cube like cells with large, spherical central nuclei
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15
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16Simple Cuboidal Epithelium
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17Simple Cuboidal EpitheliumFunctions:1.SecretionGlands such as the thyroid are composed of simple cuboidal epithelium and secrete hormones ect…2.AbsorptionIn the kidney, the proximal convoluted tubule is composed of simple cuboidal epithelium and reabsorbs water and other nutrients from the filtered fluid
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