Gas Exchange Quiz
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Questions and Answers

According to Fick’s Law, the rate of transfer through a sheet of tissue is proportional to which of the following?

  • Difference in partial pressure of gas and tissue thickness
  • Tissue area and the difference in partial pressure of gas (correct)
  • Tissue area and the diffusion coefficient
  • Tissue thickness and the diffusion coefficient

    • Which gas has the highest diffusion coefficient?

  • Helium (correct)
  • Carbon dioxide
  • Carbon monoxide
  • Oxygen

    • What is the primary driving force for net diffusion of molecules?

  • Pressure difference (correct)
  • Kinetic energy
  • Temperature
  • Molecular weight

    • What does the diffusion coefficient depend on?

    <p>Solubility and molecular weight</p> Signup and view all the answers

    What is the range of thickness for diffusion across the respiratory membrane?

    <p>0.2-0.5</p> Signup and view all the answers

    Which gas has the lowest diffusion coefficient?

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

    What does Fick’s Law state about the rate of transfer through a sheet of tissue?

    <p>Proportional to tissue area and the difference in partial pressure of gas</p> Signup and view all the answers

    What is the primary factor affecting the rate of diffusion of molecules?

    <p>Surface area</p> Signup and view all the answers

    What is the relationship between the diffusion coefficient and solubility?

    <p>Directly proportional</p> Signup and view all the answers

    What is the primary driving force for diffusion of molecules?

    <p>Pressure difference</p> Signup and view all the answers

    What factor is the diffusion coefficient inversely proportional to?

    <p>Molecular weight</p> Signup and view all the answers

    What does the diffusion coefficient depend on?

    <p>Solubility and square root of molecular weight</p> Signup and view all the answers

    What is the relationship between the partial pressures of nitrogen and oxygen in normal air at sea level?

    <p>The partial pressure of nitrogen is about 4 times higher than that of oxygen</p> Signup and view all the answers

    For a given concentration, how does the partial pressure of carbon dioxide (CO2) relate to that of oxygen (O2) dissolved in water/tissue?

    <p>The partial pressure of CO2 is much higher than that of O2</p> Signup and view all the answers

    In the alveolar air, what is the approximate concentration of oxygen (O2) compared to that in atmospheric air?

    <p>O2 concentration is lower in alveolar air than in atmospheric air</p> Signup and view all the answers

    What is the primary factor affecting the rate of diffusion of molecules?

    <p>Solubility of the molecules</p> Signup and view all the answers

    What determines the partial pressure of oxygen (PO2) and carbon dioxide (PCO2) in alveoli?

    <p>Ventilation-Perfusion Ratio (VA/Q)</p> Signup and view all the answers

    In an upright individual, how do ventilation and perfusion (blood flow) change from the apex to the base of the lung?

    <p>Both ventilation and perfusion increase, with perfusion increasing faster</p> Signup and view all the answers

    In the anatomic shunt model of ventilation-perfusion abnormalities, what happens to a portion of the cardiac output?

    <p>It bypasses the lung and mixes with oxygenated blood</p> Signup and view all the answers

    What happens in the physiological shunt model of ventilation-perfusion abnormalities?

    <p>Ventilation goes to 0 in the affected lung region</p> Signup and view all the answers

    What is the term for the combined effect of uneven ventilation and anatomic dead space resulting in wasted ventilation?

    <p>Physiological dead space</p> Signup and view all the answers

    What is the functional residual capacity (FRC) of the lungs approximately?

    <p>About 1800 mL</p> Signup and view all the answers

    What is the approximate amount of atmospheric air that reaches the alveoli?

    <p>About 500 mL</p> Signup and view all the answers

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