Chapter 21: Respiratory Function and Alterations in Gas Exchange

Chapter 21: Respiratory Function and Alterations in Gas Exchange

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE

1. The amount of gas remaining in the lungs after a maximal expiration is called the

ANS:  A

Residual volume is the amount of gas remaining in the lungs after a maximal expiration. Functional residual capacity is the amount of gas left in the lungs at the end of a normal expiration. Expiratory reserve volume is the amount of gas expired beyond tidal volume. Vital capacity is the total volume of gas that can be exhaled during maximal expiration.

REF:   Pg. 459

2. An increase in filtration of fluid from the pulmonary capillaries into the interstitium occurs with ________ pressure.

ANS:  B

When capillary hydrostatic pressure exceeds capillary colloid osmotic pressure, fluid moves from the capillary to the interstitium. Increased capillary colloid pressure, decreased capillary hydrostatic pressure, or decreased interstitial colloid pressure would all prevent fluid movement out of the capillaries.

REF:   Pg. 456

3. The central chemoreceptors for respiratory control are

ANS:  B

Central chemoreceptors for respiratory control are responsive primarily to changes in pH and CO₂. The central chemoreceptors are located in the medullary center, are responsive to pH and CO₂, and are more important than the peripheral chemoreceptors in controlling respirations.

REF:   Pg. 461

4. The peripheral chemoreceptors

ANS:  C

The peripheral chemoreceptors respond to reduced arterial oxygen (hypoxemia). The peripheral chemoreceptors are located in the aortic arch and carotid bodies, lead to hyperventilation when stimulated, and respond to pH and CO₂ levels in addition to arterial oxygen level.

REF:   Pg. 461