Gas Exchange across Respiratory Surfaces

Review Questions

The inspiratory reserve volume measures the ________.

  1. amount of air remaining in the lung after a maximal exhalation
  2. amount of air that the lung holds
  3. amount of air that can be further exhaled after a normal breath
  4. amount of air that can be further inhaled after a normal breath

Hint:

D

Of the following, which does not explain why the partial pressure of oxygen is lower in the lung than in the external air?

  1. Air in the lung is humidified; therefore, water vapor pressure alters the pressure.
  2. Carbon dioxide mixes with oxygen.
  3. Oxygen is moved into the blood and is headed to the tissues.
  4. Lungs exert a pressure on the air to reduce the oxygen pressure.

Hint:

D

The total lung capacity is calculated using which of the following formulas?

  1. residual volume + tidal volume + inspiratory reserve volume
  2. residual volume + expiratory reserve volume + inspiratory reserve volume
  3. expiratory reserve volume + tidal volume + inspiratory reserve volume
  4. residual volume + expiratory reserve volume + tidal volume + inspiratory reserve volume

Hint:

D