题目内容

关于胎儿循环的特点，哪项是错误的

A. 进入右心房的血是混合血
B. 胎儿肺动脉血大部分经动脉导管流入主动脉
C. 下腔静脉血通过卵圆孔绝大部分进入左心房
D. 来自脐静脉的血进入肝、门脉和下腔静脉
E. 胎儿上半身血液与下半身血液含氧量无差异

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