来自陈韶华的问题
吸烟和吸食毒品，首先损害的是人体的（）A.呼吸道黏膜B.血液C.肺D.大脑
吸烟和吸食毒品，首先损害的是人体的（）
A.呼吸道黏膜
B.血液
C.肺
D.大脑
1回答
2020-01-16 23:15
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高鑫
吸烟时产生烟雾里有40多种致癌物质，还有十多种会促进癌发展的物质，其中对人体危害最大的是尼古丁、一氧化碳、焦油和多种其它金属化合物，这些有毒物质通过呼吸系统进入人体，呼吸系统包括呼吸道和肺，呼吸道是气体进出的通道，因此吸烟首先危害呼吸系统的呼吸道的黏膜，然后侵入肺泡，再通过循环系统继而侵害其它的系统，A正确．
故选：A．
2020-01-16 23:19:12
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