During alveolar gas exchange, blood P(CO²) decreases from 45 to 40 mm Hg; during systemic gas exchange, blood P(CO²) increases from 40 to 45 mm Hg. Blood P(O²) increases from 40 to 104 mm Hg during alveolar gas exchange, and blood P(O²) decreases from 95 to 40 mm Hg during systemic gas exchange. What is the change in blood P(CO²) during alveolar gas exchange?
1) Increase
2) Decrease
3) Remain constant
4) Cannot be determined