I had a question regarding page 138 in the BRS Physio book. It states that at the apex (high V/Q) that there is more gas exchange even though the P02 is high and the PCO2 is low. I thought at the base of the lung, where P02 is lower and and PCO2 is high, there is the most gas exchange. Am I completely off on this? I am confused by point #4 under figure 4-11. Thanks for the help 🙂