问题 选择题

(2011•牡丹区模拟)胎儿与母体之间进行物质交换的正确途径是(  )

A.胎儿⇌脐带内血管⇌胎盘绒毛内的毛细血管⇌胎盘绒毛间的血液⇌母体的血液

B.胎儿⇌脐带内血管⇌母体的血管

C.胎儿⇌脐带内血管⇌母体的血液⇌母体

D.胎儿⇌脐带内的血管⇌胎盘⇌母体的血

答案

胎儿生活在子宫内半透明的羊水中,通过胎盘、脐带与母体进行物质交换.从母体中获得营养物质和氧,而胎儿产生的废物也是经胎盘由母体排出体外的,而胎盘靠近胎儿的一面附有脐带,脐带与胎儿相连.胎盘靠近母体的一面与母体的子宫内膜相连.胎盘内有许多绒毛,绒毛内有毛细血管,这些毛细血管与脐带内的血管相通,绒毛与绒毛之间则充满了母体的血液.所以胎儿和母体通过胎盘上的绒毛进行物质交换,而不是通过血液直接流入胎儿体内.因此胎儿与母体之间进行物质交换的途径是胎儿⇌脐带内血管⇌胎盘绒毛内的毛细血管⇌胎盘绒毛间的血液⇌母体的血液.

故选A.

阅读理解

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