Lab 1 Test Epithelium

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  1. Simple Squamous Epithelium
    • Single layer of flattened cells with disc-shaped cenral nuclei.
    • Function: diffusion and filtration where protection is not important.
    • Secretes lubricating substances in serosae.
    • Kidneys, air sacs of lungs, lining of heart, lining of ventral body cavity (serosae).
  2. Simple Cuboidal Epithelium
    • Single layer of cubelike cells with large spherical central nuclei.
    • Function: secretion and absorption.
    • Kidney tubules, ducts and secretory portions of small glands, ovary surfaces.
  3. Simple Columnar Epithelium
    • Single layer of tall cells with round oval nuclei.
    • May contain mucus-secreting unicellular glands (goblet cells)
    • Function: absorption, section of mucus, enzymes, ciliated type propels mucus or reproductive cells by ciliary action
    • Nonciliated lines: most of digestive tracts (stomach to anal), gallbladder, excretory ducts of some glands
    • Ciliated lines: small bronchi, uterine tubes, and some regions of the uterus.
  4. Pseudostratified Columnar Epithelium
    • Single layer of cells differing in heights, some may not reach free surface
    • Nuclei seen at different levels
    • May contain mucus-secreting cells and cilia
    • Function: secretion particularly of mucus, propulsion of mucus by ciliary action.
    • Nonciliated: in male's sperm-carrying ducts and ducts of large glands.
    • Ciliated: lines the trachea and most of upper respiratory tract.
  5. Stratified Squamous Epithelium
    • Thick membrane of several cell layers
    • Basal cells are cuboidal or columnar and metabolically active, in mitosis and produce more superficial layers.
    • Surface cells are flattened (squamous) in keratinized type and dead.
    • Function: protects underlying tissues in areas subject to abrasion.
    • Nonkeratinized: forms moist linings of esophagus, mouth, and vagina.
    • Keratinized: forms the epidermis of skin (a dry membrane).
  6. Stratified Cuboidal Epithelium
    • Two layers of cubelike cells
    • Function: protection.
    • Largest ducts of sweat glands, mammary glands, and salivary glands.
  7. Stratified Columnar Epithelium
    • Several cell layers, basal cells usually cuboidal, superficial cells elongated and columnar.
    • Function: protection, secretion.
    • Rare in the body, small amounts in male urethra and in large ducts of some glands.
  8. Transitional Epithelium
    • Resembles both stratified squamous and stratified cuboidal.
    • Basal cells cuboidal or columnar, surface cells dome shaped or squamouslike, depending on degree of organ stretch.
    • Function: stretches readily and permits distension of urinary organ by contained urine.
    • Lines ureters, bladder, and part of urethra.
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Lab 1 Test Epithelium
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