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【单选题】
若人为保持脑脊液pH不变,则用含高浓度CO2的人工脑脊液灌流脑室不再引起通气加强,表明A.
CO2可直接兴奋呼吸中枢
B.
CO2可直接兴奋中枢化学感受器
C.
CO2通过改变脑脊液[H+]而兴奋呼吸中枢
D.
CO2通过改变脑脊液[H+]而兴奋中枢化学感受器
E.
脑脊液中的H+可直接兴奋呼吸中枢
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