唯一能通过胎盘的Ig是A.IgG B.IgM C.SIg D.Ig E.Ig

作者: tihaiku 人气: - 评论: 0
问题 唯一能通过胎盘的Ig是
选项 A.IgG B.IgM C.SIg D.Ig E.Ig
答案 A
解析 [分析]在五类Ig中唯有 IgG能通过胎盘:这就使新生儿能通过胎盘由母体获 IgG,构成自然被动免疫。新生儿在6?8个月抵抗力强,不易生病,在1?1.5岁间自己产生 IgG,浓度低,所以抵抗力差。五类Ig中IgM合成最早,构成早期抗感染抗体。

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