When a decreased ventilation-perfusion ratio occurs,which of the following changes will occur:
I.PAO₂ will increase
II.PAO₂ will decrease
III.PACO₂ will increase
IV.PACO₂ will decrease
V.pH will decrease
A) II ,III, and V only
B) 1, III, and V only
C) II and IV only
D) I, IV, and V only

Question

Quizplus · Accepted Answer

A decreased ventilation-perfusion (V/Q) ratio indicates that there is less ventilation relative to perfusion. This leads to less oxygen being delivered to the alveoli, causing a decrease in the partial pressure of oxygen in the alveoli (PAO₂). Additionally, because there is less ventilation, carbon dioxide removal is impaired, leading to an increase in the partial pressure of carbon dioxide in the alveoli (PACO₂). The accumulation of CO₂ and the corresponding decrease in oxygen levels can lead to respiratory acidosis, thus decreasing the pH.

When a Decreased Ventilation-Perfusion Ratio Occurs,which of the Following Changes