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  4. In which one of the following options the two examples are correctly matched with its particular type of immunity? Examples Type of immunity A Polymorpho nuclear leukocytes and monocytes Cellular barriers B Anti - tetanus and anti - snake bite injections Active immunity C Saliva in mouth and tears in eyes Physical barriers D Mucus coating of the epithelium lining the urinogenital tract and the HCl in stomach Physiological barriers

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Q. In which one of the following options the two examples are correctly matched with its particular type of immunity?
Examples Type of immunity
A Polymorpho nuclear leukocytes and monocytes Cellular barriers
B Anti - tetanus and anti - snake bite injections Active immunity
C Saliva in mouth and tears in eyes Physical barriers
D Mucus coating of the epithelium lining the urinogenital tract and the $HCl$ in stomach Physiological barriers

NTA AbhyasNTA Abhyas 2020Human Health and Disease

Solution:

Immunity can be classified as innate and acquired. Innate immunity is present since birth and consists of many barriers. These include physical, physiological and cellular barriers. Physical barriers include skin and epithelium. Physiological barriers are chemical barriers and incude saliva, HCl, and tears. Cellular barriers include interleukin, interferons, white blood cells, macrophages, natural killer cells etc. Kupffer cells are macrophages of liver and polymorphonuclear cells are WBC and both are included in cellular barriers. Anti-tetanus and anti-snake bite injections are examples of passive immunity as readymade antibodies are injected.