下列免疫活动中,属于特异性免疫的是(    ) A.消化液将食物中

下列免疫活动中,属于特异性免疫的是(    )

A.消化液将食物中的细菌杀死                   B.抗体抵抗天花病毒

C.溶菌酶杀死细菌                             D.白细胞吞噬病菌

答案

B


解析:

本题考查特异性免疫和非特异性免疫的区别,非特异性免疫不是针对某一种特殊的病原体,几乎对各种病原体都有抵抗作用;特异性免疫是针对特定抗原进行的免疫。抗体是由于病原体侵入人体后,即抗原在人体内出现后刺激淋巴器官而产生的,用以对抗抗原的特殊物质,因此抗体参加的免疫活动都属于特异性免疫。而溶菌酶、白细胞和消化液等虽然也能杀死侵入人体的病菌,但不是针对某一种特殊的病原体,几乎对各种病原体都有抵抗作用,因此属于非特异性免疫。

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