题目

  Three Japanese tourists taking a holiday in Australia got stuck when their GPS told them they could drive from the mainland to an island，failing to mention the 15 kilometres of water and mud in between．     As they drove their hired car from Moreton Bay to nearby North Stradbroke Island，they started to notice the firm surface they were driving on giving way to the well-known bay mud．However, being confident that their GPS would direct them to a road soon，they decided to drive on，managing to travel around 500 metres before their car was up to its tires in mud．To make 如图是人体部分生理活动示意图，请分析回答（1）食物中的淀粉在[A]_____系统中最终分解为葡萄糖，葡萄糖被吸收进入[B]系统后，首先到达心脏的_____，在心室与动脉之间有瓣膜，其作用是_____。（2）人体与外界进行气体交换的重要场所是_____。空气中的氧气进入血液后，与红细胞中的_____结合，血液变成含氧丰富的_____。（3）[D]系统形成尿液的器官是_____。尿液中的尿素浓度比原尿高，这是因为_____重新吸收了大部分的_____。（4）葡萄糖和氧在组织细胞中进行分解，释放_____，供生命活动需要。