Tissues - Tissue: The Living Fabric PART A Tissues

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Tissue: The Living Fabric P A R T A
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2 Tissues ¡ Groups of cells similar in structure and  function ¡ The four types of tissues l Epithelial l Connective l Muscle l Nerve
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3 Epithelial Tissue ¡ Cellularity – composed almost entirely of  cells ¡ Form continuous sheets held together by  tight junctions and desmosomes ¡ Polarity – apical and basal surfaces
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4 Classification of Epithelia Figure 4.1a
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5 Classification of Epithelia Figure 4.1b
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6 Epithelia: Simple Squamous ¡ Single layer of flattened cells  l  Disc-shaped nuclei l  Sparse cytoplasm ¡ Functions   l Diffusion and filtration l Provide a slick, friction-reducing lining  in lymphatic and cardiovascular  systems
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7 Epithelia: Simple Squamous ¡ Present in the kidney glomeruli, lining of  heart, blood vessels, lymphatic vessels,  and serosae
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8 Epithelia: Simple Cuboidal ¡ Single layer of cube-like cells  l Spherical central nuclei ¡ Function in secretion and absorption ¡ Present in kidney tubules, ducts and  secretory portions of small glands, and  ovary surface
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9 Epithelia: Simple Columnar ¡ Single layer of tall cells  l  Oval nuclei; many contain cilia ¡ Goblet cells are often found in this layer ¡ Function in absorption and secretion ¡ Nonciliated type line digestive tract and  gallbladder
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10 Epithelia: Simple Columnar ¡ Ciliated type line small bronchi, uterine  tubes, and some regions of the uterus ¡ Cilia help move substances through  internal passageways
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11 Epithelia: Pseudostratified Columnar ¡ Single layer of cells with different heights;  some do not reach the free surface ¡ Nuclei are seen at different layers ¡ Function in secretion and propulsion of  mucus ¡ Present in the male sperm-carrying ducts  (nonciliated) and trachea (ciliated)
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12 Epithelia: Stratified Squamous ¡ Thick membrane composed of several  layers of cells ¡ Function in protection of underlying areas  subjected to abrasion  ¡ Forms the external part of the skin’s  epidermis (keratinized cells), and linings  of the esophagus, mouth, and vagina  (nonkeratinized cells)
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13 Epithelia: Stratified Cuboidal and Columnar ¡ Stratified cuboidal l Quite rare in the body l Found in some sweat and mammary  glands l Typically two cell layers thick
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14 Epithelia: Stratified Cuboidal and Columnar ¡ Stratified columnar  l Limited distribution in the body l Found in the male urethra, and lining  some glandular ducts l Also occurs at transition areas  between two other types of epithelia
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15 Epithelia: Transitional ¡ Several cell layers, basal cells are  cuboidal, surface cells are dome shaped ¡ Stretches to permit the distension of the  urinary bladder ¡ Lines the urinary bladder, ureters, and  part of the urethra
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22 Epithelia: Glandular ¡
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Tissues - Tissue: The Living Fabric PART A Tissues

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