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

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The immune system is the system of our body that protects us against the infections and diseases.
This system comprises two components :

1. The humoral immune system which is mediated by the antibodies.

2. The cell mediated immune system which is mediated by T-cells.

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43. Briefly describe the cells of the immune system.

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44. Distinguish between B-cells and T-cells.

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45. Write structure of antibody (Immunoglobulin) molecule.

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46. Give the name and functions of four classes of antibodies.

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47.

How B-cells respond to antigens?

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48.

How T-cells respond to antigens?

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49. Differentiate antibodies and interferons.

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50. What is autoimmunity ? Explain.

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