Immunodeficiency makes a person highly susceptible to infection. It is caused by

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7.Human Health and Disease

normal

Immunodeficiency makes a person highly susceptible to infection. It is caused by

Lack of $B-$cells

Lack of $T-$cells

Both $(a)$ and $(b)$

None of the above

Solution

The $B-$cells and T-cells are produced in bone marrow. The $T-$cells ($T-$helper cells) stimulate $B-$cells to produce antibodies. Antibodies are the main component of immune system. Immunodeficiency is characterized by a very low number of circulating lymphocytes ($B$ and $T-$cells) and the affected persons usually die at an early stage.

Standard 12

Biology