Types of Immunity and Defense Mechanisms — NEET Biology
📚 Practice ConceptImmunity is of two types: (i) Innate immunity and (ii) Acquired immunity.
Which of the following statements about the body's innate immune barriers are NOT correct? S1: The skin provides a physical barrier, while the mucous coating in the respiratory tract acts as a cytokine barrier. S2: Acid in the stomach and saliva in the mouth are examples of physiological barriers that prevent microbial growth. S3: Phagocytic leukocytes like neutrophils and macrophages constitute a part of the cellular barriers of innate immunity. S4: Interferons secreted by virus-infected cells are crucial components of the cytokine barrier, protecting non-infected cells. S5: Natural Killer (NK) cells, a type of lymphocyte, are primarily involved in the specific recognition and destruction of pathogens, making them part of acquired immunity.
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