下列关于人在剧烈运动时生理变化过程的描述,正确的是( ) A.

下列关于人在剧烈运动时生理变化过程的描述,正确的是(  )

A.大量失钠,对细胞外液渗透压的影响大于细胞内液

B.大量乳酸进入血液,血浆由弱碱性变为弱酸性

C.胰高血糖素分泌量上升,促进肝糖元和肌糖元分解

D.血液中O2含量下降,刺激了呼吸中枢促进呼吸运动

答案

A(钠离子主要在细胞外液中,大量失钠对细胞外液渗透压的影响大于细胞内液;人体的内环境中存在缓冲对,即使剧烈运动产生大量乳酸,血浆的pH基本维持不变;胰高血糖素分泌量上升,只能促进肝糖元分解成葡萄糖;血液中CO2含量上升,刺激了呼吸中枢促进呼吸运动。)

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