Alveolar gas partial pressures at rest
A) Are relatively constant because the tidal volume is a small fraction of the FRC
B) Vary widely during each breath because fresh air replaces “stale” alveolar air during each
breath
C) Vary widely because the blood squirts through unevenly during each ejection cycle of the
heart
D) Are the sam e as those in moist tracheal air
E) Are relatively constant because the tidal volume is a small fraction of the TLC

Question

Quizplus · Accepted Answer

Alveolar gas partial pressures are relatively constant at rest because the tidal volume is a small fraction of the functional residual capacity (FRC), which acts as a buffer, maintaining stable gas concentrations.

Alveolar Gas Partial Pressures at Rest