Question:
Immune system is said to reject any foreign substance that enter inside human body .But male gamete(sperm) is a foreign body to female tract,then why it is not rejected by immune system
Answer:
Sperms are foreign to both men , who produces this and women , who receives it. Sperms do not come in contact with blood once deposited into vagina.Hence no immune response against sperms is caused in women. In normal women, sperms are deposited in the vagina and they gain access to the cervix and uterus within minutes. The acidic environment in the vagina kills the remaining sperms.
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