Respiratory System: Alveolar Cells and Blood-Air Barrier
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Questions and Answers

What is the function of pneumocyte type I cells in the alveoli?

  • Secreting surfactant
  • Involved in gas exchange (correct)
  • Acting as phagocytes
  • Producing mucus
  • What can be identified by examining the alveolar walls under high dry (40x) lens?

  • Elastic fibers (correct)
  • Absence of Clara cells
  • Presence of basal bodies
  • High density of goblet cells
  • Which type of epithelium lines the bronchioles where cilia become fewer?

  • Stratified squamous keratinized epithelium
  • Stratified squamous non-keratinized epithelium
  • Simple squamous epithelium
  • Simple columnar epithelium (correct)
  • What is the function of Clara cells in the respiratory tract?

    <p>Secreting surfactant to reduce surface tension</p> Signup and view all the answers

    Which type of epithelial lining forms the large air spaces in the lung?

    <p>Simple squamous epithelium</p> Signup and view all the answers

    What happens to the number of goblet cells as the epithelium transitions to bronchioles?

    <p>Goblet cells decrease and eventually disappear</p> Signup and view all the answers

    What is the main characteristic that distinguishes stratified squamous non-keratinized epithelium from stratified squamous keratinized epithelium?

    <p>Tough waterproof outer layer of dead flat cells</p> Signup and view all the answers

    What is the function of pneumocyte type II cells in the alveoli?

    <p>Production of surfactant</p> Signup and view all the answers

    Which epithelium is typically found on surfaces subjected to wear-and-tear?

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

    What makes up the blood-air barrier in the alveoli?

    <p>Pneumocyte type I cells</p> Signup and view all the answers

    Why do stratified squamous non-keratinized epithelia have many cell layers?

    <p>To resist mechanical stresses</p> Signup and view all the answers

    What is the primary function of elastic fibers in the alveolar wall?

    <p>Provide structural support and elasticity</p> Signup and view all the answers

    What type of epithelium lines the trachea according to the text?

    <p>Pseudostratified columnar epithelium</p> Signup and view all the answers

    In which part of the gastrointestinal tract can we find simple columnar epithelium?

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

    Where are the terminal bars located in the jejunum?

    <p>Deep to the brush border</p> Signup and view all the answers

    Which structure in the jejunum is composed of closely packed microvilli?

    <p>Brush border</p> Signup and view all the answers

    Which part of the body contains simple cuboidal epithelium in small ducts that are difficult to find without practice at microscopy?

    <p>Gall bladder</p> Signup and view all the answers

    What type of epithelium lines the finger-like projections (villi) at the luminal surface of the jejunum?

    <p>Simple columnar epithelium</p> Signup and view all the answers

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