Respiratory System Anatomy Quiz
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Questions and Answers

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

  • To regulate air exchange in the alveoli
  • To produce mucus in the alveoli
  • To produce surfactant in the alveoli (correct)
  • To filter out dust from the alveoli
  • What is the name of the membrane-bound organelles containing whorls of phospholipid produced by type II cells?

  • Lysosomes
  • Lamellar bodies (correct)
  • Endoplasmic reticulum
  • Golgi apparatus
  • What forms from the extruded lamellar bodies in the alveolar lumen?

  • Bronchioles
  • Tubular myelin (correct)
  • Alveolar sacs
  • Pulmonary vessels
  • How do the phospholipids of surfactant line up in the alveoli?

    <p>With their hydrophobic fatty acid tails facing the alveolar lumen</p> Signup and view all the answers

    What happens to the surface tension in the alveoli as they enlarge during inspiration?

    <p>It increases</p> Signup and view all the answers

    What happens to the surfactant molecules as the alveoli enlarge during inspiration?

    <p>They move further apart</p> Signup and view all the answers

    What happens to the surface tension in the alveoli as they decrease in size during expiration?

    <p>It decreases</p> Signup and view all the answers

    What happens to some of the protein-lipid complexes in surfactant after secretion?

    <p>They are taken up by endocytosis in type II alveolar cells and recycled</p> Signup and view all the answers

    What is the relationship between surface tension and surfactant concentration per unit area in the alveoli?

    <p>Surface tension is inversely proportional to surfactant concentration</p> Signup and view all the answers

    What is the importance of surfactant in the alveoli?

    <p>It reduces surface tension in the alveoli</p> Signup and view all the answers

    What is the average distance between air and blood in the alveoli?

    <p>0.5 um</p> Signup and view all the answers

    What is the primary function of pulmonary alveolar macrophages (PAMs) in the lungs?

    <p>To ingest small particles and process inhaled antigens</p> Signup and view all the answers

    Which part of the diaphragm is also the inferior part of the pericardium?

    <p>Central tendon</p> Signup and view all the answers

    What is the effect of contraction of the crural fibers of the diaphragm on the esophagus?

    <p>It compresses the esophagus</p> Signup and view all the answers

    What is the primary action of the external intercostal muscles during inspiration?

    <p>They elevate the ribs</p> Signup and view all the answers

    What is the consequence of transection of the spinal cord above the 3rd cervical segment?

    <p>Death due to respiratory failure</p> Signup and view all the answers

    What is the primary function of the pleural fluid?

    <p>To prevent friction between the pleural surfaces</p> Signup and view all the answers

    What is the average volume of pleural fluid in healthy adults?

    <p>15-20 mL</p> Signup and view all the answers

    Which layer of the pleura lines the chest cavity?

    <p>Parietal pleura</p> Signup and view all the answers

    What is the effect of contraction of the costal fibers of the diaphragm on intra-abdominal pressure?

    <p>It increases intra-abdominal pressure</p> Signup and view all the answers

    What is the primary function of the respiratory system?

    <p>To transport gases in and out of the body</p> Signup and view all the answers

    What is the name of the region of the respiratory tract that includes the nose, nasal cavity, and mouth?

    <p>Upper airway</p> Signup and view all the answers

    What is the approximate size of particulates that tend to not be inhaled through the nose?

    <p>20-50um</p> Signup and view all the answers

    What is the name of the gene that is abnormal in cystic fibrosis?

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

    What is the effect of the most common mutation causing cystic fibrosis on the CFTR protein?

    <p>It limits the amount of CFTR protein that reaches the plasma membrane</p> Signup and view all the answers

    What is the result of suppressed chloride secretion in the airways in cystic fibrosis?

    <p>Enhanced Na+ reabsorption in the airways</p> Signup and view all the answers

    What is the approximate percentage of the alveolar epithelial surface area covered by type I cells?

    <p>95%</p> Signup and view all the answers

    What is the name of the type of epithelial cells that are thicker and contain numerous lamellar inclusion bodies in the alveoli?

    <p>Type II cells</p> Signup and view all the answers

    What is the approximate percentage of epithelial cells in the alveoli that are type II cells?

    <p>60%</p> Signup and view all the answers

    What is the name of the bacterium that often causes repeated pulmonary infections in individuals with cystic fibrosis?

    <p>Pseudomonas aeruginosa</p> Signup and view all the answers

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