Immunity And Human Immune System- Class 12 Biology The science dealing with the various phenomena of immunity, induced sensitivity and allergy is called immunology . Types of Immunity: There is two major types of immunity: innate and acquired immunity. (A) Innate or Natural or Nonspecific Immunity (L. innatus = inborn) Innate immunity is inherited by an organism from the parents and protects it from birth throughout life. Innate or nonspecific immunity lacks specific responses to specific invaders. This type of immunity is provided by various barriers present in our body. Innate immunity consists of four types of barriers— physical, physiological, cellular and cytokine barriers. (B) Acquired Immunity (= Adaptive or Specific Immunity) The immunity that an individual acquires after the birth is called acquired or adaptive or specific immunity. It is specific and mediated by antibodies or lymphocytes or both which make the antigen harmless. It not only relieves t
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