Respiratory System Multiple Choice Questions and Answers

11. Which of the following does (do) not apply to the trachea or bronchi?

1. goblet cells
2. carina
3. cilia
4. simple squamous epithelium

12. Which of the following is the correct sequence in which inspired air flows?

1. choana, pharynx, nasal fossa, larynx, trachea, bronchus, and lung
2. nasal fossa, pharynx, larynx, choana, trachea, bronchus, and lung
3. nasal fossa, choana, pharynx, larynx, trachea, bronchus, and lung
4. choana, nasal fossa, larynx, pharynx, trachea, bronchus, and lung

13. On its way to the pulmonary alveoli, inspired air comes in contact with various kinds of epithelia in the sequence

1. simple squamous, stratified squamous, simple cuboidal, and pseudostratified ciliated columnar epithelia.
2. pseudostratified ciliated columnar, stratified squamous, simple cuboidal, and simple squamous epithelia.
3. stratified squamous, pseudostratified ciliated columnar, simple cuboidal, and simple squamous epithelia.
4. pseudostratified ciliated columnar, stratified squamous, simple squamous, and simple cuboidal epithelia.

14. The functional units of the respiratory system, where gas exchange occurs are

1. the pulmonary alveoli.
2. the pleurae.
3. the lungs.
4. the pulmonary vessels.

15. Which of the following statements is false concerning the pulmonary alveoli?

1. They are lined with ciliated epithelium.
2. They are moistened with surfactant.
3. They number about 350 million per lung.
4. They permit diffusion of respiratory gases.

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).