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下面丙图是人体血液与组织细胞之间的物质交换示意图，请根据丙图回答下列问题 （1）图中红细胞中的氧来自于外界空气，空气中的氧在人体肺的细细管处进入血液，并与红细胞中的______结合，随血液循环到达组织细胞处，因此，红细胞具有运输______的功能． （2）图中血液里的营养物质主要来自于食物，食物在消化道内被消化成可以吸收的营养物质，这些物质主要在______处被吸收进入血液． （3）按图中血液流动的方向，此处细血管流出的血液应该是______，原因是：______．
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