Sheet 4 Physiology
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Questions and Answers

What is the volume that normal people like us can reach in their lungs?

  • Minimal volume
  • Resting volume
  • Maximum volume
  • Residual volume (correct)
  • Is it possible for normal people to reach minimal volume in their lungs?

  • No, they can't reach minimal volume (correct)
  • People with lung diseases can reach minimal volume
  • Only athletes can reach minimal volume
  • Yes, they can reach minimal volume
  • Which volume of the lungs indicates that normal people like us cannot reach minimal volume?

  • Minimal volume
  • Maximum volume
  • Residual volume (correct)
  • Resting volume
  • If someone can reach the resting volume of their lungs, are they considered normal in this context?

    <p>No, they are not normal</p> Signup and view all the answers

    Which lung volume can normal individuals not achieve as stated in the text?

    <p>Minimal volume</p> Signup and view all the answers

    What does the slope represent in the context provided?

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

    What is the resting volume of the lung referred to as?

    <p>Minimal Volume (MV)</p> Signup and view all the answers

    Why does the lung lose its tendency to collapse at resting volume?

    <p>Due to being at its resting state</p> Signup and view all the answers

    In the formula Slope= ΔV/ ΔP, what does ΔV represent?

    <p>Volume change</p> Signup and view all the answers

    What is another term used for the resting volume of the lung?

    <p>Stressed Volume (SV)</p> Signup and view all the answers

    In the context provided, which stage involves inflating a partially inflated lung with little force?

    <p>Stage 2</p> Signup and view all the answers

    What is not recommended in the context of the uncompliant lung?

    <p>Inflate a totally inflated lung</p> Signup and view all the answers

    Why do we refer to the backward process as hysteresis in the context provided?

    <p>Because it has a different curve than the forward process</p> Signup and view all the answers

    Which component has an approximate compliance of 200ml/1cmH2O?

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

    What are the two components that make up the respiratory system analogy provided in the text?

    <p>Lung and Thorax</p> Signup and view all the answers

    What percentage of the dynamic work is required to overcome the viscosity of the lung and chest wall structures?

    <p>20%</p> Signup and view all the answers

    Which type of forces need to be overcome to perform the work mentioned in the text?

    <p>Non-elastic forces</p> Signup and view all the answers

    What aspect of the lung and chest wall structures contributes to the dynamic work that needs to be overcome?

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

    If the dynamic work is 100 units, how many units are needed to overcome the viscosity of the lung and chest wall structures?

    <p>20 units</p> Signup and view all the answers

    What happens to the remaining 80% of dynamic work after accounting for the viscosity of the lung and chest wall structures?

    <p>It is used to overcome elasticity</p> Signup and view all the answers

    At functional residual capacity in a normal male adult, what happens to the arterial oxygen partial pressure (PaO2)?

    <p>It remains the same</p> Signup and view all the answers

    At functional residual capacity in a normal male adult, what happens to the arterial carbon dioxide partial pressure (PaCO2)?

    <p>It remains the same</p> Signup and view all the answers

    What happens to lung compliance at functional residual capacity in a normal male adult?

    <p>It remains the same</p> Signup and view all the answers

    Which of the following is true regarding lung volumes at functional residual capacity?

    <p>Expiratory reserve volume is fully utilized</p> Signup and view all the answers

    What happens to alveolar pressure compared to atmospheric pressure at functional residual capacity in a normal male adult?

    <p>Alveolar pressure is equal to atmospheric pressure</p> Signup and view all the answers

    At functional residual capacity in a normal male adult, what happens to lung recoil pressure?

    <p>It remains constant</p> Signup and view all the answers

    What role does surfactant play at functional residual capacity in the respiratory system analogy provided?

    <p>Maintains alveolar inflation</p> Signup and view all the answers

    Why is it important for the lung to have a tendency to collapse at minimal volume?

    <p>To maintain proper gas exchange efficiency</p> Signup and view all the answers

    How does lung compliance change from minimal volume to functional residual capacity in a normal male adult?

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

    Which component contributes most significantly to the dynamic work needed to overcome the viscosity of lung and chest wall structures?

    <p>Pleural space</p> Signup and view all the answers

    What is true about the lung compliance at functional residual capacity in a normal male adult?

    <p>It decreases compared to other lung volumes</p> Signup and view all the answers

    Which force needs to be overcome in the context provided to perform the work mentioned?

    <p>Viscous forces in the lung and chest wall structures</p> Signup and view all the answers

    What role does surfactant play at functional residual capacity?

    <p>Prevents alveolar collapse during exhalation</p> Signup and view all the answers

    What happens to alveolar pressure compared to atmospheric pressure at functional residual capacity in a normal male adult?

    <p>Alveolar pressure is higher than atmospheric pressure</p> Signup and view all the answers

    What happens to the arterial oxygen partial pressure (PaO2) at functional residual capacity in a normal male adult?

    <p>It decreases compared to other lung volumes</p> Signup and view all the answers

    What is true about the backward process referred to as hysteresis in the context provided?

    <p>It occurs due to changes in alveolar volume during inhalation and exhalation</p> Signup and view all the answers

    What volume of the lungs indicates that normal individuals cannot reach minimal volume?

    <p>Total lung capacity</p> Signup and view all the answers

    Why is it important for the lung to have a tendency to collapse at minimal volume?

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

    What happens to the remaining 80% of dynamic work after accounting for the viscosity of lung and chest wall structures?

    <p>It is utilized for overcoming elastic forces in the lung tissue</p> Signup and view all the answers

    What aspect of the lung and chest wall structures contributes significantly to the dynamic work needed to be overcome?

    <p>Elasticity of lung tissue</p> Signup and view all the answers

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