Which Statement on Perfusion or Ventilation in Humans Is True

Multiple Choice

Which statement on perfusion or ventilation in humans is true?

A) Perfusion delivers O₂ to the exchange surface.
B) Perfusion carries away CO₂ that has diffused across the exchange surface.
C) Ventilation delivers O₂ to the environmental side of the exchange surface.
D) During exhalation, alveolar and pleural cavity pressure rise and become positive.
E) Ventilation carries away O₂ that has diffused across the exchange surface.