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【简答题】
如图是人体血液循环模式图，请分析回答： （1）用图中的序号、名称（只写出心脏各腔以及相连的主要血管）和箭头表示出体循环路线（[]）：______ （2）用图中的序号、名称（只写出心脏各腔以及相连的主要血管）和箭头表示出肺循环路线（[]）：______ （3）人体从外界吸入的氧与体内产生的二氧化碳在[______]______（[]内填图中结构代码，其后填相应结构的名称）处进行交换，由此血液的性质发生了变化，即______ （4）血液能在人体血管中循环，主要是因为构成心脏的肌肉发达，能够______，将血液泵至全身；血液在人体内之所以能按一定的方向流动，是因为______． （5）若某人患急性肺炎，需上肢静脉点滴药液．试写出药液从其上肢静脉到达肺部经过的路径：______（用图中序号和箭头表示）．
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