3 Tissues

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3 Tissues

  1. 1. Tissues group of similar cells that perform a common function
  2. 2. Types of Tissues  1) Epithelium * covers body/organ surfaces * lines body cavities * forms glands  2) Connective * binds/supports/protects other tissues and organs  3) Muscle * moves body, materials within body  4) Nervous * makes up the nervous system
  3. 3. CHARACTERISTICS OF EPITHELIA  Cellularity  Polarity  apical surface  basal surface  Bound to underlying tissue by a basement membrane  Avascularity  High regenerative capacity  Classified by LAYERS:  1) Simple Epithelium - one layer thick  2) Stratified Ep. - many layers thick  protective function  Classified by cell SHAPE: 1) Squamous - flattened cells 2) Cuboidal - about as tall as they are wide 3) Columnar - taller than wider shaped cells
  4. 4. Epithelial- GLANDS  Exocrine Glands formed from epithelial tissues- they secrete their materials onto a free surface  A. Unicellular * one cell * secrete mucus  B. Multicellular * secrete materials through a duct
  5. 5. Connective Tissue  CHARACTERISTICS OF C.T.  derived from mesenchyme (embryonic CT)  Consists of: 1) Cells 2) Fibers (protein) 3) Ground Substance  CT typically is vascular
  6. 6. CLASSIFICATION OF C.T.  Connective Tissue Proper  Cartilage  Bone (Osseous Connective Tissue)  1) Compact * outer shell of bone  2) Spongy * inner lattice-work of bone * houses hemopoietic tissue  Vascular Tissue (Blood)
  7. 7. Muscle Tissue  A. Skeletal Muscle Tissue * long, cylindrical cells * multinucleated * nuclei at periphery of cell * striations  B. Cardiac Muscle Tissue * short, cylindrical cells * some cells are bifurcated (branching) * has one or two centrally-located nuclei * intercalated discs * striations  C. Smooth (Visceral) Muscle Tissue * spindle-shaped cells * one centrally-located nucleus

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