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CBSE Class 12-science Answered

(i)Why does a doctor administer tetanus antitoxin and not a tetanus vaccine to a child injured in a roadside accident with a bleeding wound? Explain. (ii)Describe the role of lymph nodes in providing immunity. 
Asked by Topperlearning User | 11 Jun, 2014, 01:04: PM
answered-by-expert Expert Answer

(i) Tetanus is caused by a microbe which has a deadly and fast action. Action of vaccine is slow which becomes fatal. Therefore, antitoxins are administered which neutralize the effect of the bacterial toxin.

(ii) Lymph nodes trap microorganisms. These trapped antigens activate lymphocytes present in the lymph and cause an immune response.

Answered by | 11 Jun, 2014, 03:04: PM

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