Pulmonary Circulation and Gas Exchange Quiz
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Questions and Answers

During gas exchange in the lungs, diffusion primarily occurs at which interface?

  • Alveolar air/blood gas exchange interface (correct)
  • Pulmonary circulation loop
  • Blood/tissue gas exchange interface
  • Systemic circulation loop
  • Which step is NOT involved in the process of external respiration?

  • Gas diffusion
  • Ventilation
  • Gas transport between capillary blood and tissue cells
  • Cellular respiration (correct)
  • What is the term for the volume of air exhaled after maximum inspiration?

  • Residual volume
  • Vital capacity (correct)
  • Tidal volume
  • Total lung capacity
  • At rest on a typical American diet during the post-absorptive state, what is the ratio of oxygen consumption to carbon dioxide production?

    <p>1:2</p> Signup and view all the answers

    In Fick's equation for gas diffusion, what does 'A' represent?

    <p>Area of the membrane</p> Signup and view all the answers

    What is the approximate surface area of the human lung responsible for gas exchange?

    <p>75 m²</p> Signup and view all the answers

    What is the primary muscle involved in normal inspiration during respiration?

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

    Which process involves oxidative phosphorylation to produce energy?

    <p>Cellular respiration</p> Signup and view all the answers

    Which lung volume results in the mixing of 'fresh' and 'stale' air?

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

    In which loop is the pulmonary circulation characterized as a low-pressure loop?

    <p>Pulmonary loop</p> Signup and view all the answers

    What happens during expiration (deflation) in respiration?

    <p>Diaphragm relaxes</p> Signup and view all the answers

    What is the average diffusion distance for the alveolus/capillary diffusion interface?

    <p>~100-200µm</p> Signup and view all the answers

    What effect does a decrease in pH or an increase in PCO2 have on oxygen affinity?

    <p>Decrease oxygen affinity</p> Signup and view all the answers

    Which factor promotes oxygen delivery to active warmed muscles during exercise?

    <p>Increase in temperature</p> Signup and view all the answers

    What does an increase in 2,3-diphosphoglycerate (2,3-DPG) do to oxygen affinity?

    <p>Decrease oxygen affinity</p> Signup and view all the answers

    How does an increase in temperature affect oxygen affinity?

    <p>Decrease oxygen affinity</p> Signup and view all the answers

    What is the primary effect of the Bohr effect (pH) on hemoglobin's affinity for oxygen?

    <p>Decreases oxygen affinity</p> Signup and view all the answers

    Which factor facilitates oxygen unloading at tissues without affecting oxygen binding at respiratory surfaces?

    <p>Decrease in pH</p> Signup and view all the answers

    What is the primary regulator in air-breathers for ventilation according to the information provided?

    <p>CO2</p> Signup and view all the answers

    Where are the central chemoreceptors located for detecting oxygen/CO2 levels?

    <p>Medulla oblongata</p> Signup and view all the answers

    What is the percentage of O2 in atmospheric air at sea level?

    <p>21%</p> Signup and view all the answers

    How is most of the oxygen transported in blood?

    <p>Bound to hemoglobin</p> Signup and view all the answers

    What does each hemoglobin molecule bind reversibly to?

    <p>4 oxygen molecules</p> Signup and view all the answers

    What is the main factor that affects hemoglobin's affinity for oxygen?

    <p>Oxygen partial pressure in blood</p> Signup and view all the answers

    Which type of curve does myoglobin exhibit in terms of oxygen binding?

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

    Where do the central pattern generators for ventilatory movements initiate from?

    <p>Medulla oblongata</p> Signup and view all the answers

    What is the total atmospheric pressure at sea level?

    <p>760 mmHg</p> Signup and view all the answers

    In a gas mixture, how does each gas contribute to the total pressure?

    <p>By its partial pressure</p> Signup and view all the answers

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