Chapter 27 Physiology of the Respiratory System

Chapter 27  Physiology of the Respiratory System

TRUE/F ALSE

1. The major factor that determines the movement of air into or out of the lungs is a pressure gradient.

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2. A primary function of the respiratory system is to supply tissue with adequate oxygen and to remove carbon dioxide.

ANS: T DIF: Memorization REF: Page 824 TOP: Introduction

3. For air to remain in the lungs, the pressure in the lungs must be equal to or less than atmospheric pressure.

ANS: T DIF: Memorization TOP: Mechanisms of Pulmonary Ventilation

4. Standard atmospheric pressure is usually about 760 mm Hg.

phenomenon called elastic recoil.
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TOP: Expiration

6. The inspiratory capacity is equal to the sum of the tidal volume and the inspiratory reserve volume.

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7. The amount of air that could be forcibly expired after normal expiration is called the functional residual capacity.

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REF: Page 824
5. The tendency of the lungs and thorax to return to their preinspiration volume is a physical

ANS: T DIF: Memorization TOP: Mechanism of Pulmonary Ventilation

Mosby items and derived items © 2013, 2010, 2007, 2003 by Mosby, Inc., an affiliate of Elsevier Inc.

Test Bank 27A-2

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MULTIPLE CHOICE

1. Which of the following is not a regulated process associated with the functioning of the respiratory system?

1. Transport of gases
2. Gas exchange in lungs and tissue

c. Control of cell metabolism rate d. Pulmonary ventilation

ANS: C DIF: Memorization TOP: Respiratory Physiology

2. Standard atmospheric pressure is _____ mm Hg. a. 650

b. 700 c. 760 d. 800

ANS: C DIF: Memorization TOP: Mechanisms of Pulmonary Ventilation

REF: Page 824

REF: Page 824

3. Boyle law states that the volume of a gas varies _____ with pressure at a _____ temperature.

1. directly; constant
2. inversely; constant
3. directly; constantly changing
4. inversely; constantly changing

ANS: B DIF: Memorization TOP: Mechanisms of Pulmonary Ventilation

4. Which muscles are used for forced expiration?

1. Sternocleidomastoid and abdominal muscles
2. Sternocleidomastoid and intercostals
3. External intercostals and pectoralis muscles
4. Abdominal muscles and internal intercostals

ANS: D DIF: Memorization TOP: Mechanisms of Pulmonary Ventilation

REF: Page 826

REF: Page 831

Mosby items and derived items © 2013, 2010, 2007, 2003 by Mosby, Inc., an affiliate of Elsevier Inc.

Test Bank

27B-2

5. When the pressure in the lung is greater than atmospheric pressure:

1. inspiration occurs.
2. expiration occurs.
3. lung tissue has collapsed.
4. the bronchioles are obstructed.

ANS: B DIF: Application REF: Page 824 TOP: Mechanisms of Pulmonary Ventilation

6. The vital capacity is equal to the sum of the:

1. inspiratory capacity and the residual volume.
2. inspiratory reserve volume, tidal volume, and expiratory reserve volume.
3. tidal volume, residual volume, and expiratory reserve volume.
4. inspiratory reserve volume, tidal volume, and inspiratory capacity.

ANS: B DIF: Memorization REF: Page 834 TOP: Pulmonary Capacities

7. The term used to describe the volume of air exchanged during normal inspiration and expiration is:

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

ANS: C DIF: Memorization TOP: Pulmonary Capacities

8. During inspiration, the expansion of the lungs causes:

1. cohesion of visceral and parietal pleura.
2. a pressure gradient from alveoli to atmosphere.
3. a decrease in alveolar pressure.

REF: Page 834

d. an increase in intrathoracic pressure from about –6 to –4 mm Hg.
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TOP: Mechanisms of Pulmonary Ventilation