Epithelial Tissue Functions and Characteristics
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Questions and Answers

What is the main function of epithelial tissue?

  • Support
  • Contraction
  • Diffusion (correct)
  • Energy production

    • How are epithelial cells nourished?

  • They do not require nourishment
  • Directly from the bloodstream
  • By the surrounding connective tissue (correct)
  • By diffusion from the external environment

    • Which membrane of the epithelial cell is directed towards the lumen?

  • Cytoplasmic membrane
  • Apical plasma membrane (correct)
  • Basal plasma membrane
  • Lateral plasma membrane

    • What is the role of the basement membrane in relation to epithelial tissue?

    <p>Anchoring epithelial cells to the underlying connective tissue</p> Signup and view all the answers

    Why are epithelial cells described as polarized?

    <p>Their different structures in the apical, lateral, and basal domains</p> Signup and view all the answers

    What characterizes the apical domain of epithelial cells?

    <p>Abundant ion channels and transport proteins</p> Signup and view all the answers

    What is the main function of microvilli in the small intestine and renal tubules?

    <p>Transport and absorption</p> Signup and view all the answers

    Where do cilia mostly appear in the body?

    <p>Respiratory tract</p> Signup and view all the answers

    What is the function of stereocilia in the male reproductive system and in the cochlea?

    <p>Increase absorption surface and help movement of the medium</p> Signup and view all the answers

    Which structure provides rigidity to epithelial cells, making them resistant to external damages?

    <p>Keratin</p> Signup and view all the answers

    Which structure forms a continuous band around the entire perimeter of the cell and seals completely the space between cells?

    <p>Zonula occludens or tight junction</p> Signup and view all the answers

    What is the main function of desmosomes in the lateral zones of epithelial cells?

    <p>Join the two cells and attach their cytoskeletons</p> Signup and view all the answers

    Where is the basement membrane located?

    <p>Between epithelia and connective tissue</p> Signup and view all the answers

    What feature classifies simple squamous epithelium?

    <p>A single layer of thin, flattened cells.</p> Signup and view all the answers

    Where would you find mesothelium in the body?

    <p>Peritoneal cavities.</p> Signup and view all the answers

    What is the main function of simple cuboidal epithelium?

    <p>Filters substances.</p> Signup and view all the answers

    Where do desmosomes mostly appear within epithelial cells?

    <p>At the lateral zones.</p> Signup and view all the answers

    Where does simple columnar epithelium with microvilli appear?

    <p>Digestive tract, gallbladder, and large gland ducts</p> Signup and view all the answers

    Where does stratified squamous keratinized epithelium appear?

    <p>Skin epidermis</p> Signup and view all the answers

    Which type of epithelium lines the ducts of some glands and can be used for absorption and secretion?

    <p>Stratified cuboidal epithelium</p> Signup and view all the answers

    In which part of the body does pseudostratified columnar epithelium mostly appear?

    <p>Respiratory tract</p> Signup and view all the answers

    What is the main function of urothelium (transitional epithelium)?

    <p>Protection</p> Signup and view all the answers

    Which type of glands do not have an excretory duct and pour their secretion into the blood or lymphatic stream?

    <p>Endocrine glands</p> Signup and view all the answers

    What is the nature of secretion in holocrine glands?

    <p>Maturation and release of dead cells</p> Signup and view all the answers

    Where do goblet cells, a type of unicellular gland, appear?

    <p>Digestive or respiratory track</p> Signup and view all the answers

    What distinguishes stratified squamous keratinized epithelium from stratified squamous mucosal epithelium?

    <p>The nature of secretion</p> Signup and view all the answers

    What is the main function of pseudostratified columnar epithelium?

    <p>Transport</p> Signup and view all the answers

    What distinguishes cordonal endocrine glands from follicular endocrine glands?

    <p>The shape of the endocrine cells</p> Signup and view all the answers

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