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下图是呼吸、消化、循环、泌尿系统的功能联系示意图，①～⑥表示生理过程或物质，请据图回答下列问题： （1）①②表示肺泡与血液之间的气体交换，①所指的气体名称是_______。 （2）③表示营养物质经消化系统消化后吸收进入循环系统。消化主要是通过多种______的作用，把大分子营养物质分解为小分子营养物质。 （3）经过④⑤的气体交换后，血液变化是_________。（提示：动脉血与静脉血的转变） （4）⑥是指通过泌尿系统把体内代谢废物以及多余的无机盐排出体外，这一生理过程叫_________。
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