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下图是人体血液循环中血液与组织细胞之间的物质交换过程图。请据图回答下列问题： ⑴上图中的物质交换过程发生哪一个血液循环中？ 循环。经过此处的物质交换后，血液由 血变成 血。 ⑵A、B、C分别表示人体内的三种血管，根据图中血液流动方向，可以判断A是动脉，则B是 ，C是 。 ⑶人体血液由血浆和血细胞两部分组成。图中的2表示血细胞中的 细胞，该细胞里面含有一种红色含 的蛋白质，叫作血红蛋白。
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