Respiratory System Multiple Choice Questions and Answers for Practice

16. The region where a bronchus and pulmonary vessel enter and exit the lung is

1. the capsule.
2. the base.
3. the hilum.
4. the apex.

17. Which of the following statements is false concerning the structure of the left lung?

1. It is subdivided into a superior lobe and an inferior lobe.
2. It contains a cardiac notch.
3. It contains 10 bronchial segments.
4. Its apex extends above the level of the clavicle.

18. Of the following serous membranes, the one that lines the thoracic walls and the thoracic surface of the diaphragm is

1. the parietal pleura.
2. the pleural peritoneum.
3. the mediastinal pleura.
4. the visceral pleura.

19. The pleurae perform all of the following functions except that of

1. separating the thoracic viscera.
2. secreting serous fluid.
3. forming an effective pressure chamber.
4. facilitating the diffusion of respiratory gases.

20. The principal muscles responsible for the inspiration phase of pulmonary ventilation are

1. the diaphragm and internal intercostal muscles.
2. the scalenes and internal intercostal muscles.
3. the internal and external intercostal muscles.
4. the diaphragm, external intercostal muscles, and internal intercostal muscles (interchondral part).

21. When the external intercostal muscles contract, the thoracic volume increases

1. vertically.
2. anteroposteriorly.
3. inferiorly.
4. superiorly.

22. Which of the following muscles does (do) not contract during extreme forced expiration—as in coughing?

1. the internal intercostals
2. the transverse abdominis
3. the diaphragm
4. the internal abdominal oblique

23. Air that is moved in and out of the lungs during normal quiet breathing is called

1. tidal volume.
2. vital capacity.
3. residual volume.
4. inspiratory reserve volume.

24. When a person takes a very deep breath of air just prior to diving into water, this volume of air is referred to as

1. the tidal volume.
2. the vital capacity.
3. the residual volume.
4. the inspiratory reserve volume.

25. When the “wind” is knocked out of a football player because of a hard blow to the thorax or abdomen, the airthat is actually forced out of his lungs is

1. the tidal volume.
2. the vital capacity.
3. the residual volume.
4. the inspiratory reserve volume.

26. The principal respiratory center that directly controls breathing is located in

1. the cerebrum.
2. the hypothalamus.
3. the lung.
4. the medulla oblongata.

27. The diaphragm is innervated by

1. the inspiratory nerves.
2. the phrenic nerves.
3. the vagus nerves.
4. the intercostal nerves.

28. Which of the following does (do) not contain respiratory chemoreceptors?

1. aortic arch
2. carotid arteries
3. lungs
4. medulla oblongata

29. The two cranial nerves that transmit sensory information to the brain from the peripheral, respiratory chemoreceptors are

1. the facial and vagus nerves.
2. the facial and glossopharyngeal nerves.
3. the glossopharyngeal and hypoglossal nerves.
4. the glossopharyngeal and vagus nerves.

30. During embryonic development, the olfactory placode becomes

1. the nasal cavity.
2. the larynx.
3. the trachea.
4. the lung.