What causes the residual volume (RV) and functional residual ...

[Frost2351]

What causes the residual volume (RV) and functional residual capacity (FRC) to increase?
 
  a. Atelectasis
  b. Chronic obstructive lung disease
  c. Pneumonia
  d. Pneumothorax

Question 2

In which of the following conditions is total lung capacity (TLC) always reduced?
 
  a. Restrictive lung disease
  b. Obstructive lung disease
  c. Combined restrictive and obstructive dis-ease
  d. Acute airways obstruction

[abctaiwan]

Answer to Question 1

ANS: B
The RV and FRC are usually enlarged in acute and chronic obstructive lung diseases because of hyperinflation and air trapping.

Answer to Question 2

ANS: A
The TLC is always reduced in restrictive lung diseases because of a loss of lung volume; the RV and functional residual capacity are often reduced proportionately.
Carbon monoxide (CO) is the gas normally used to measure the DL.