Histology of Gas Exchange Region and Process of Gas Exchange in Alveoli
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Questions and Answers

What is the primary determinant of the rate of diffusion according to Fick's Law?

  • The pressure difference across the diffusion surface
  • The area of the diffusion surface
  • The diffusion constant of the gas (correct)
  • The thickness of the diffusion membrane

    • What is the main advantage of the flat upper portion of the oxygen dissociation curve?

  • It assists the diffusion of oxygen into tissue cells
  • It maintains a constant blood PO2 even if alveolar gas PO2 falls (correct)
  • It allows for the withdrawal of large amounts of oxygen by peripheral tissues
  • It allows for maximum oxygen loading in the lungs

    • Why is a molecule with a high affinity for oxygen best suited for oxygen loading in the lungs?

  • To maintain a constant blood PO2 in the lungs
  • To allow for the withdrawal of large amounts of oxygen by peripheral tissues
  • To ensure maximum oxygen loading in the alveoli (correct)
  • To ensure maximum oxygen unloading in the tissues

    • What is the relationship between ventilation (V) and perfusion (Q) in normal, healthy individuals?

    <p>V and Q are perfectly matched</p> Signup and view all the answers

    What is the primary mechanism for oxygen transport and delivery in the body?

    <p>Binding of oxygen to hemoglobin in red blood cells</p> Signup and view all the answers

    What is the main advantage of the steep lower portion of the oxygen dissociation curve?

    <p>It allows for the withdrawal of large amounts of oxygen by peripheral tissues</p> Signup and view all the answers

    Which of the following statements about the gas exchange region of the lung is correct?

    <p>The alveoli are lined with a simple squamous epithelium to facilitate efficient gas exchange.</p> Signup and view all the answers

    Which of the following cell types are involved in alveolar function?

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

    How does oxygen reach the tissues from the lungs?

    <p>Oxygen diffuses from the alveoli into the capillaries and is then carried to the tissues by hemoglobin in red blood cells.</p> Signup and view all the answers

    How is carbon dioxide removed from the body?

    <p>Carbon dioxide diffuses from the tissues into the capillaries and is then carried to the alveoli by hemoglobin in red blood cells.</p> Signup and view all the answers

    What is the primary function of the air-blood barrier in the alveoli?

    <p>To facilitate efficient gas exchange between the alveoli and the capillaries</p> Signup and view all the answers

    What is the purpose of the oxygen dissociation curve?

    <p>To illustrate the relationship between partial pressure of oxygen and the percentage of hemoglobin saturation with oxygen</p> Signup and view all the answers

    What is the primary factor that promotes oxygen unloading from hemoglobin in tissues?

    <p>Decreased hydrogen ion (H+) concentration</p> Signup and view all the answers

    Which statement best describes the relationship between the partial pressure of carbon dioxide (PCO2) and carbon dioxide concentration in blood?

    <p>The relationship is linear, with deoxygenated blood carrying more CO2 than oxygenated blood at a given PCO2.</p> Signup and view all the answers

    In the process of carbon dioxide transport, what is the role of carbonic anhydrase (CA) in red blood cells?

    <p>CA catalyzes the conversion of HCO3- to CO2 in red blood cells.</p> Signup and view all the answers

    What is the primary mechanism by which carbon dioxide is transported in oxygenated blood?

    <p>Bicarbonate (HCO3-) in plasma</p> Signup and view all the answers

    Which of the following factors does NOT promote oxygen loading onto hemoglobin in the alveoli?

    <p>Decreased temperature</p> Signup and view all the answers

    In the process of gas exchange, what is the primary role of the chloride shift?

    <p>To maintain electrical neutrality during the exchange of HCO3- and H+ across the red blood cell membrane</p> Signup and view all the answers

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