Immunity is defined as the overall capability of an organism to protect itself from any foreign agent. It can be divided into innate and acquired immunity. Innate immunity consists of nonspecific, physical barriers that prevent foreign agents to enter the body. Examples are nasal hair, mucus lining on the epithelium of urogenital tract, respiratory tract, the acid in stomach etc. Acquired immunity consists of humoral immunity (antigen-mediated) and cell-mediated immunity (T-lymphocyte mediated). Acquired or adaptive immunity can be subdivided into naturally and artificially acquired both of which are further divided into active and passive immunity.

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Chapter 9, Problem 12TY

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Immunity is defined as the overall capability of an organism to protect itself from any foreign agent. It can be divided into innate and acquired immunity. Innate immunity consists of nonspecific, physical barriers that prevent foreign agents to enter the body. Examples are nasal hair, mucus lining on the epithelium of urogenital tract, respiratory tract, the acid in stomach etc. Acquired immunity consists of humoral immunity (antigen-mediated) and cell-mediated immunity (T-lymphocyte mediated). Acquired or adaptive immunity can be subdivided into naturally and artificially acquired both of which are further divided into active and passive immunity.

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