Practice Questions on the Respiratory System
Page 3

  1. When the inspiratory muscles contract:
    1. The diameter of the thoracic cavity increases
    2. The length of the thoracic cavity increases
    3. The volume of the thoracic cavity is decreased
    4. The diameter and length of the thoracic cavity both increase
    5. None of the above

  2. Damage to which of the following would result in cessation of breathing?
    1. The pneumotaxic center
    2. The medulla
    3. Lung stretch receptors
    4. The apneustic center
    5. The pons

  3. Which respiratory muscles would contract as you blew air into a balloon?
    1. Diaphragm
    2. Internal intercostals
    3. External intercostals
    4. All of the above

  4. Which statement about CO2 is incorrect?
    1. Its concentration in the blood is decreased by hyperventilation
    2. Its accumulation in the blood is associated with a drop in pH
    3. More CO2 dissolves in the blood plasma than is carried on RBCs
    4. [CO2]VENOUS is greater than [CO2]ARTERIAL

  5. The main inspiratory center of the brain is the _____________. It signals the _____________ (the main inspiratory muscle)
    to contract via the _____________ nerve.
    For questions 62 and 63, consider the following substances:
    1. H+
    2. CO2
    3. O2
    4. HCO3-
    5. Na+

  6. Which of the above can cross the blood-brain barrier?
  7. Which of the above directly affect(s) medullary chemoreceptors?
  8. Diaphragm contraction causes the thoracic volume to ________ and the thoracic pressure to ___________.
  9. The most important receptors for respiration regulation are:
    1. Located in the brachial artery
    2. Most sensitive to changes in Po2
    3. Affected by changes in pH
    4. Not found in the medulla

  10. As plasma pH decreases, hemoglobin's O2 affinity will _________.
  11. As ACH is injected iv, bronchiole diameter will __________________.
  12. You begin to hyperventilate! What happens to your plasma Pco2? What about your plasma pH?
  13. In the above question, what acid-base imbalance will likely result, prior to compensation?
  14. As blood flows through the pulmonary capillaries, Cl- in the plasma will ________________.
  15. Which of the following are functions of components of the respiratory system?
    1. Warming and moistening of inhaled air
    2. Delivering oxygen to and removing carbon dioxide from the blood
    3. Assisting in the maintenance of blood pH
    4. All of the above
    5. 2 of the above

  16. Which of the following occurs during inspiration?
    1. Diaphragm contracts and flattens
    2. Intrathoracic pressure does not change
    3. External intercostals relax
    4. Thoracic volume decreases

  17. As pulmonary edema progresses during congestive heart failure, the rate of O2 diffusion in the lung..
  18. As pleural space pressure increases, lung volume...
  19. As the presence of dipalmitoylphosphatidylcholine (a surfactant) in the alveoli decreases, lung compliance...
  20. As exhalation proceeds, alveolar wall tension...
  21. In a fit of anger, you jab your A&P instructor with a syringe full of 1M NaOH. You sit back and watch with delight as he doubles over. You notice that his respiration has changed? How did it change and why?????

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