Pressure Changes in Alveoli Quiz
24 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

During inspiration, the pressure within the lungs (intrapulmonary pressure) is _________ the air pressure outside the body.

  • equal to
  • unrelated to
  • less than (correct)
  • greater than

    • During expiration, the pressure in the lungs _________ and the volume in the thorax _________.

  • increases, decreases (correct)
  • increases, increases
  • decreases, increases
  • decreases, decreases

    • The pressure changes required for adequate ventilation at rest are _________.

  • variable
  • quite large
  • small (correct)
  • moderate

    • Which of the following is NOT one of the four components of respiration?

    <p>Capillary diffusion</p> Signup and view all the answers

    Which of the following is an advantage of nasal breathing?

    <p>The air is filtered to minimize respiratory infections</p> Signup and view all the answers

    Where does gas exchange occur in the lungs?

    <p>Respiratory bronchioles and alveoli</p> Signup and view all the answers

    What does the arterial–mixed venous oxygen difference across muscle describe?

    <p>Differences in oxygen content in the blood of resting and active people</p> Signup and view all the answers

    What does the oxyhemoglobin dissociation curve describe?

    <p>The effects of oxygen and carbon dioxide in the body</p> Signup and view all the answers

    Which of the following is the correct equation for pressure in the pulmonary circulation?

    <p>Pressure = flow × resistance</p> Signup and view all the answers

    Which of the following is true about the respiratory membrane?

    <p>It is composed of the alveolar wall, the capillary wall, and their respective basement membranes</p> Signup and view all the answers

    According to Henry's law, gases dissolve in liquids in proportion to their _________.

    <p>Partial pressures</p> Signup and view all the answers

    Which gas has a much lower diffusion constant than oxygen?

    <p>Carbon dioxide</p> Signup and view all the answers

    What is the pressure gradient for oxygen across the respiratory membrane?

    <p>65 mmHg</p> Signup and view all the answers

    What is the oxygen diffusion capacity expressed as?

    <p>Volume of oxygen diffused per minute per 1 mmHg of pressure difference</p> Signup and view all the answers

    Which of the following is NOT a function of pulmonary diffusion?

    <p>Filtering out foreign particles from the air</p> Signup and view all the answers

    What is the maximum amount of air that can be expired after a maximal inspiration called?

    <p>Vital capacity</p> Signup and view all the answers

    What is the main function of the respiratory pump?

    <p>Assisting in venous return</p> Signup and view all the answers

    Which of the following is true about the oxygen diffusion capacity during maximal exercise?

    <p>It increases by up to three times the resting rate</p> Signup and view all the answers

    What is the gradient between the mean partial pressure of the pulmonary capillary and the alveolar air?

    <p>11 mmHg</p> Signup and view all the answers

    What is the approximate diffusion of oxygen per minute through the respiratory membrane?

    <p>231 ml</p> Signup and view all the answers

    What is the primary cause of the increase in oxygen diffusion capacity from rest to exercise?

    <p>Limited perfusion of the upper regions of the lungs</p> Signup and view all the answers

    What is the approximate PCO2 of the blood passing from the right side of the heart through the alveoli?

    <p>46 mmHg</p> Signup and view all the answers

    What is the approximate PCO2 of the air in the alveoli?

    <p>40 mmHg</p> Signup and view all the answers

    What is the pressure gradient for carbon dioxide exchange?

    <p>6 mmHg</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser