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Human Health and Disease

Long Answer Type

41. Write name of causative agent of pneumonia. List symptoms and modes of transmission.

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Short Answer Type

42. What is Immune system ? Mention the two types (components) of immune system.

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43. Briefly describe the cells of the immune system.

The major cells of the immune system are the WBCs called lymphocytes. Lymphocytes that are critical for immune reactions are of two types : B-cells and T-cells.
B-cells produce anibodies in response to antigens and provide protection against the pathogens inside our blood.

T-cells do not produce antibodies but help the B-cells to produce it.

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