Human Physiology Chapter 8: Respiratory System II
36 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

What is the total lung capacity equal to?

  • Anatomical dead space + alveolar dead space
  • Residual volume only
  • Vital capacity only
  • Vital capacity + residual volume (correct)

    • What is the function of the upper respiratory tract and airways?

  • Air conditioning, warming, filtering, and humidifying inspired air (correct)
  • Regulating breathing rate
  • Producing mucus
  • Gas exchange

    • What is the anatomical dead space?

  • The volume of air in the alveoli
  • The volume of air that takes part in gas exchange
  • The upper respiratory tract and airways as far as the terminal bronchioles (correct)
  • The volume of the lungs after expiration

    • What is the instrument used to measure respiratory volumes and capacities?

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

    What type of disease involves increased airway resistance?

    <p>Obstructive pulmonary disease</p> Signup and view all the answers

    What is the sum of the anatomical and alveolar dead space known as?

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

    What is the primary role of the surface tension of pleural fluid?

    <p>To resist the actual separation of the lung and thoracic wall</p> Signup and view all the answers

    What happens to the intrapleural pressure during inspiration?

    <p>It decreases due to the increased volume of the pleural cavity</p> Signup and view all the answers

    What is the relationship between intrapleural pressure and pulmonary pressure?

    <p>Intrapleural pressure is always lower than pulmonary pressure</p> Signup and view all the answers

    What would happen if the intrapleural pressure became equal to the atmospheric pressure?

    <p>The lungs would collapse</p> Signup and view all the answers

    What is the effect of pneumothorax on the lungs?

    <p>It causes the lungs to collapse</p> Signup and view all the answers

    What is the function of the transpulmonary pressure?

    <p>To create the suction to keep the lungs inflated</p> Signup and view all the answers

    What is the result of plugged bronchioles?

    <p>Atelectasis occurs</p> Signup and view all the answers

    Why do changes in the intrapleural pressure of one lung not affect the other lung?

    <p>Because each lung has its own pleural cavity and pleural membranes</p> Signup and view all the answers

    What is the primary direction of oxygen diffusion during internal respiration?

    <p>From the systemic capillaries into the cells</p> Signup and view all the answers

    What is the PO2 of the blood in the systemic capillaries before gas exchange occurs?

    <p>100 mm Hg</p> Signup and view all the answers

    What occurs when equilibrium is reached during internal respiration?

    <p>The blood in the systemic capillaries has a PO2 of 40 mm Hg and a PCO2 of 45 mm Hg</p> Signup and view all the answers

    What factor affects the exchange of oxygen and carbon dioxide during internal respiration?

    <p>The rate of blood flow in a specific tissue</p> Signup and view all the answers

    What is the direction of carbon dioxide diffusion during internal respiration?

    <p>From the cells into the systemic capillaries</p> Signup and view all the answers

    What is the PO2 of the tissue cells before gas exchange occurs?

    <p>40 mm Hg</p> Signup and view all the answers

    What is pulmonary ventilation?

    <p>The exchange of air between the atmosphere and the lungs</p> Signup and view all the answers

    According to Boyle's Law, what is the relationship between pressure and volume of a gas?

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

    Which factor does NOT affect pulmonary ventilation?

    <p>Blood pressure</p> Signup and view all the answers

    During inspiration, what happens to the pressure inside the lungs?

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

    What is referred to as intrapulmonary pressure (Ppul)?

    <p>Pressure within the lungs</p> Signup and view all the answers

    Which pressure is always described relative to atmospheric pressure?

    <p>Respiratory pressure</p> Signup and view all the answers

    What is the term used to describe the pressure within the pleural cavity?

    <p>Intrapleural pressure</p> Signup and view all the answers

    Why do gas molecules exert less pressure in a larger volume container?

    <p>Because gas molecules strike the wall less frequently</p> Signup and view all the answers

    What happens to the volume of the thoracic cage during inspiration?

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

    What is the intrapulmonary pressure compared to atmospheric pressure during inspiration?

    <p>Ppul &lt; Patm</p> Signup and view all the answers

    What occurs to the lungs during expiration?

    <p>The lungs recoil and the intrapulmonary volume decreases</p> Signup and view all the answers

    What muscles are involved in forced expiration?

    <p>Abdominal and internal intercostal muscles</p> Signup and view all the answers

    What factor does NOT hinder air passage and pulmonary ventilation?

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

    What mechanism requires energy during pulmonary ventilation?

    <p>Inspiratory muscles enlarging the thorax</p> Signup and view all the answers

    What happens to intrapleural pressure during inspiration?

    <p>It becomes more negative</p> Signup and view all the answers

    Which statement best describes the process of forced expiration?

    <p>It is an active process involving the activity of abdominal and internal intercostal muscles</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser