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【单选题】
关于呼吸的环节的说法,错误的是A.
呼吸包括三个环节:外呼吸、气体在血液中的运输和内呼吸
B.
外呼吸分为肺通气和肺换气
C.
肺通气是指肺血管与环境之间进行的气体交换过程.
D.
肺换气是指肺泡气与肺血管血液之间的气体交换
E.
内呼吸即组织换气,指血液与组织细胞之间的气体交换过程
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