Which of the Following Does NOT Occur When Blood Flow

Multiple Choice

Which of the following does NOT occur when blood flow to an area of the lungs is reduced but the area receives normal air flow

A) The concentration of CO₂ in this area decreases.
B) The change in CO₂ concentration causes the smooth muscles of the local airways to relax.
C) The change in CO₂ concentration leads to increased resistance of local airways.
D) The change in O₂ concentration leads to dilation of local blood vessels.