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Epithelial Tissue (Characteristics Common to all types of Epithelia…

- - - - B.More Than One Layer: Stratified Epithelial Tissues
        
        Stratified cuboidal epithelium-cuboidal cell in apical region, two layer cells , protects underlying tissue from glandular secretion. Forms ducts of large glands, two layer of cubelike cells
        
        Funtion: protection
        
        Location: Sweat glands(large ducts), mammary glands, and salivary glands
        
        Stratified columnar epithelium-Columnar cell in apical region, two layer cells, protects underlying tissue, several cell layers
        
        Function:: protection , secretion
        
        Loation: Rare,male urethra, large ducts of some glands
        
        Transitional epitheliium: Looks some what like stratified squamous and stratified cuboidal , cells dome shaped or squamous like, depends on how much organs stretches
        
        Function: Stretches,changes shape for example when a bladder is full , protection
        
        Location: Lines ureters, bladder and some parts of urethra
        
        Stratified squamous epithelium-Squamous cells in apical region, multiple layer of cells
        
        Location: Lining of esophagus, mouth, vagina, epidermis of skin
        
        Function: Protects underlying tissues in areas that abrasion can occur
      - A.One Layer: Simple Epithelial Tissues
        
        Simple Cuboidal Epithelium- Single layer of cubelike cells with large spherical central nuclei,square circular shaped cells
        
        Location: Kidney tubules ducts,, and secretory portions of small glands , ovary surface
        
        Function: Secretion and absorption(allow rapid passage through epithelial layer)
        
        Simple Columnar Epithelium: Single layer of tall cells with round to oval nuclei ,some cells bear cillia layer , contains goblet cells(mucus),rectangular shaped cells
        
        Location: Nonciliated, digestive tract, stomach to rectum gallbladder , excretory ducts of some glands, ciliated lines of small bronchi, uterine tubes, some parts of uterus
        
        Function: Absorption,secretion of mucus, enzymes
        
        Simple squamous epithelium-single layer of flattened cells with disc shaped central nuclei and cytoplasm.Thin, flat cells
        
        Location: Kidney glomeruli, air sacs of lungs, lining heart, blood vessels, lymphatic vessels, lining of ventral body cavity
        
        Function: Rapid transport of molecules/Allows passage of materials by diffusion and filtration in sites where protection is not important produces lubricating fluid
      - Pseudostratified Columnar Epithelium : Single layer of cells of differing heights some not reaching the free surface nuclei seen at different layers. May contain goblet cells(produce secretion)mucus and cilia(move fluid). Falsely stratified, one layer.Columnar cell shaped.
        
        Location: Nonciliated in male's sperm-carrying ducts and ducts of large glands, ciliated variety lines the trachea , upper respiratory tract
        
        Function: Secretion of mucus, ciliary action
    - - Squamous Cells-are flat cells with flat disc shaped nuclei
      - Cuboidal Cells-Cube shaped cells with spherical centrally located nuclei
- - - - Absorption- brings small molecules into cells**
      - Diffusion- Movement of molecules down their concentration gradient
      - Secretion - Releases molecules from cells
      - Filtration- Passage of small molecules
      - Protection - Underlying tissues
      - sensory reception*
- - - - Mucus- covers, protects and lubricates many internal body surfaces
  - - - Compound glands-have a brached duct
      - Simple glandss- unbranched duct
    - - Tubular-senscretory cells form tubes
      - Alveolar or acinar(grape/berry ) -secretory cells form spherical sacs /small hollow cavity