Answers

#88 Trachea and Esophagus

What criteria do you use to distinguish between the esophagus and the trachea?_Different types of epithelium, absence of cartilage rings in esophagus_

QUESTIONS

  1. What is the distinctive structural component of the wall of the trachea? Cartilage rings.
  2. What does the EM demonstrate regarding the air-blood barrier? Capillaries are interposed between epithelial lining cells of adjacent alveoli.
  3. What are the features that distinguish bronchi from bronchioles? See chart at beginning of lab description.
  4. What is the importance of elastin in the respiratory system? Allows for expandability and return to original volume during expiration.
  5. Which cells are responsible from keeping the lungs free from obstructing particulate matter? How do they carry out this function? Macrophages (dust cells). How do they carry out this function? Phagocytosis.
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