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Histology

Histology. Study of tissues. Tissue is a group of cells with common origin and function. Matrix. Composition of Tissue:. 1. Cells 2. Fibers ( formed intercellular material) 3. Amorphous ground substance. Body Tissues. Four primary types Epithelium Connective tissue Nervous tissue

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Histology

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  1. Histology Study of tissues. Tissue is a group of cells with common origin and function. Matrix Composition of Tissue: • 1. Cells • 2. Fibers (formed intercellular material) • 3. Amorphous ground substance

  2. Body Tissues • Four primary types • Epithelium • Connective tissue • Nervous tissue • Muscle

  3. Epithelial Tissues • Found in different areas • Body coverings • Body linings • Glandular tissue • Functions • Protection • Absorption • Filtration • Secretion

  4. Epithelium Characteristics • Cells fit closely together • Tissue layer always has one free surface • The lower surface is bound by a basement membrane • Avascular (have no blood supply) • Regenerate easily if well nourished

  5. Classification of Epithelium • Number of cell layers • Simple – one layer • Stratified – more than one layer • Shape of cells • Squamous – flattened • Cuboidal – cube-shaped • Columnar – column-like

  6. Connective Tissue • Found everywhere in the body • Includes the most abundant and widely distributed tissues • Functions • Binds body tissues together • Supports the body • Provides protection

  7. Connective Tissue Characteristics • Variations in blood supply • Some tissue types are well vascularized • Some have poor blood supply or are avascular • Extracellular matrix • Non-living material that surrounds living cells

  8. Glands Gland – one or more cells that secretes a particular product Endocrine glands Endo = inside Crine = to secrete Exocrine glands Exo = outside Crine = to secrete

  9. Endocrine Glands Secrete hormones No duct Secrete directly into body fluids Exocrine Glands • Secrete to outside of body • Always have a duct • Secrete onto a surface • Secrete tears, saliva, milk, etc.

  10. Types of Tissue Repair • Regeneration • Replacement of destroyed tissue by the same kind of cells • OR • Fibrosis • Repair by dense fibrous connective tissue (scar tissue) • Determination of method • Type of tissue damaged • Severity of the injury

  11. Events in Tissue Repair • Capillaries become very permeable • Introduce clotting proteins • Wall off injured area • Formation of granulation tissue • Regeneration of surface epithelium

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