4 unit 1 chapter 4. 4 unit 1 groups of cells with common role 4 basic types: epithelial connective...
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TissuesTissuesTissuesTissues
Chapter 4
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TissuesTissuesTissuesTissues
•groups of cells with common role
• 4 basic types:•Epithelial•Connective•Muscular•Nervous
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EpithelialEpithelial Tissue TissueEpithelialEpithelial Tissue Tissue
• Cells close together – continuous sheets• Cover surfaces & line cavities- always a
free surface =Apical surface• Basement membrane of connective
tissue• No blood vessels- avascular• Have a nerve supply
• High capacity for cell division.
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Categories- Table 4.1Categories- Table 4.1Categories- Table 4.1Categories- Table 4.1
• Simple epithelium = 1 layer of cells
• Stratified Epithelium= more than 1 layer of cells
• Cell Shapes = squamous, cuboidal, columnar, transitional (change shape)
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Simple EpitheliumSimple EpitheliumSimple EpitheliumSimple Epithelium
• Squamous= single layer of flat cells.
• Important for filtration (kidneys) or diffusion (lungs & capillaries)
• Called endothelium when lining heart, blood and lymphatic vessels
• Called mesothelium when in serous membranes
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Simple Squamous Epithelium
single layer of flat cells
Simple Squamous Epithelium
single layer of flat cells
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Simple Squamous Epithelium
single layer of flat cells
Simple Squamous Epithelium
single layer of flat cells
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Simple Squamous Epithelium
single layer of flat cells
Simple Squamous Epithelium
single layer of flat cells
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Simple Cuboidal Epitheliumcube shaped cells, rounded nucleiSimple Cuboidal Epitheliumcube shaped cells, rounded nuclei
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Simple Cuboidal Epitheliumcube shaped cells, rounded nucleiSimple Cuboidal Epitheliumcube shaped cells, rounded nuclei
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Simple Columnar EpitheliumMay be ciliated or non-ciliated
Simple Columnar EpitheliumMay be ciliated or non-ciliated
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Simple Columnar EpitheliumMay be ciliated or non-ciliated
Simple Columnar EpitheliumMay be ciliated or non-ciliated
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Simple Columnar EpitheliumMay be ciliated or non-ciliated
Simple Columnar EpitheliumMay be ciliated or non-ciliated
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Simple Columnar EpitheliumMay be ciliated or non-ciliated
Simple Columnar EpitheliumMay be ciliated or non-ciliated
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Pseudostratified Columnar appears stratified: nuclei at
various levels
Pseudostratified Columnar appears stratified: nuclei at
various levels
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Pseudostratified Columnar appears stratified: nuclei at
various levels
Pseudostratified Columnar appears stratified: nuclei at
various levels
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Stratified Squamous Stratified Squamous EpitheliumEpithelium
Stratified Squamous Stratified Squamous EpitheliumEpithelium
• Apical layer cells are flat
• Deep layers vary from cuboidal to columnar
• Cells in the basal layer divide and move upward toward apical surface
• Found in areas of surface wear & tear
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Table 4.1f figure 1Table 4.1f figure 1
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Table 4.1f figure 2Table 4.1f figure 2
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Stratified Cuboidal Epithelium
rare
Stratified Cuboidal Epithelium
rare
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Stratified Cuboidal Epithelium
rare
Stratified Cuboidal Epithelium
rare
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Stratified Columnar Epithelium
rare
Stratified Columnar Epithelium
rare
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Stratified Columnar Epithelium
rare
Stratified Columnar Epithelium
rare
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Transitional Epitheliumvariable in appearance—cells can
stretch
Transitional Epitheliumvariable in appearance—cells can
stretch
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Transitional Epitheliumvariable in appearance—cells can
stretch
Transitional Epitheliumvariable in appearance—cells can
stretch
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Glandular Epithelium-Endocrine
Glandular Epithelium-Endocrine
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Glandular Epithelium-Endocrine
Glandular Epithelium-Endocrine
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Glandular Epithelium-Endocrine
Glandular Epithelium-Endocrine
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Glandular Epithelium-Endocrine
Glandular Epithelium-Endocrine
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Connective TissueConnective TissueConnective TissueConnective Tissue
• Most abundant tissue type• small cells far apart• large amount of extracellular
material (matrix)• Often good blood supply
– Found between other tissues
• Classified using matrix characteristics
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Connective Tissue CellsConnective Tissue Cellsvary with tissue typevary with tissue type
Connective Tissue CellsConnective Tissue Cellsvary with tissue typevary with tissue type
• Fibroblasts- present in several tissuessecrete fibers & ground substance
• Macrophages- from monocytesEngulf bacteria & cell debris by phagocytosis
• Plasma cells- develop from B lymphocytesMake antibodies
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Connective Tissue CellsConnective Tissue CellsConnective Tissue CellsConnective Tissue Cells
• Mast cells- near blood cellspart of reaction to injury- histamine
• Adipocytes= fat cells or adipose cellsStore triglycerides (fat)
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Extracellular MatrixExtracellular MatrixExtracellular MatrixExtracellular Matrix
• Fluid, gel or solid plus protein fibers• Ground substance-between cells and fibers• Fibers- 3 types• Collagen fibers: very strong & flexible• Elastic fibers: smaller stretch and return to
original length• Reticular fibers: provide support & strength
found in basement membranes & organ support
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Figure 4.2Figure 4.2
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Loose Connective TissueLoose Connective TissueLoose Connective TissueLoose Connective Tissue
• Areolar
• Adipose
• Reticular
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Table 4.2a figure 1Table 4.2a figure 1
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Table 4.2a figure 2Table 4.2a figure 2
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Table 4.2b figure 1Table 4.2b figure 1
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Table 4.2b figure 2Table 4.2b figure 2
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Table 4.2c figure 1Table 4.2c figure 1
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Table 4.2c figure 2Table 4.2c figure 2
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ClassificationClassificationClassificationClassification
• Dense Connective tissueDense regularDense irregularElastic
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Table 4.2d figure 1Table 4.2d figure 1
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Table 4.2d figure 2Table 4.2d figure 2
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Table 4.2e figure 1Table 4.2e figure 1
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Table 4.2e figure 2Table 4.2e figure 2
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Table 4.2f figure 1Table 4.2f figure 1
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Table 4.2f figure 2Table 4.2f figure 2
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CartilageCartilageCartilageCartilage
• Dense network of collagen & elastic fibers embedded in chondroitin sulfate
• stronger than dense fibrous• Cells = chondrocytes • Occur singly or in groups• Found in spaces called lacunae• Surrounded by perichondrium• No blood vessels or nerves
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Classification - CartilageClassification - CartilageClassification - CartilageClassification - Cartilage
• 3 types•Hyaline- fibers not easily visible•Fibrocartilage- fibers visible• Strongest type. E.g. in vertebral
discs•Elastic- chondrocytes in
threadlike network e.g. ear cartilage
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Table 4.2g figure 1Table 4.2g figure 1
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Table 4.2g figure 2Table 4.2g figure 2
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Table 4.2h figure 1Table 4.2h figure 1
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Table 4.2h figure 2Table 4.2h figure 2
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Table 4.2i figure 1Table 4.2i figure 1
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Table 4.2i figure 2Table 4.2i figure 2
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Bone = Osseous TissueBone = Osseous TissueBone = Osseous TissueBone = Osseous Tissue
• More dense matrix includes Calcium & phosphorus salts
• Details in Chapter 6
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Liquid Connective TissueLiquid Connective TissueLiquid Connective TissueLiquid Connective Tissue
• Blood- matrix = plasma More in chapter 14
• Lymph- matrix like blood but with less proteinMore in chapter 17
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Muscular TissueMuscular TissueMuscular TissueMuscular Tissue
• large, elongated cells• contractile cells • Skeletal muscle tissue -named
for location• Cardiac muscle tissue- forms wall
of heart• Smooth muscle tissue –found in
walls of hollow organs
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Neural TissueNeural TissueNeural TissueNeural Tissue
• Nerve cells & neuroglia•Neurons- convert stimuli into
nerve impulses and conduct them
•Neuroglia –do not generate nerve impulses.
• Serve supportive functions
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• 4 types of body (not cell) membranes• Mucous Membranes –line body
cavities opening to exteriorSecrete mucus
• Serous Membranes- surround moving organsSecrete serous fluid
• Synovial Membranes- line cavities of some joints.Secrete synovial fluid
Body MembranesBody MembranesBody MembranesBody Membranes
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Tissue RepairTissue RepairTissue RepairTissue Repair
• New cells from stroma or parenchyma • Epithelial cells originate from stem cells
in defined areas of tissue layer• Bone regenerates readily, cartilage
poorly• Muscular tissue can replace cells but
slowly• Nerve tissue is poorest at replacement
although some stem cells seem to be available.
• Replacement from stroma –> scar tissue & functional loss.