Mucousa associated lymphoid tissue constitutes_____ % of lymphoid tissue in human body.

50

The correct answer is Option (1) –50

The primary lymphoid organs are where lymphocytes (a type of white blood cell involved in the immune system) mature and develop. The primary lymphoid organs include the bone marrow and the thymus gland.

After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer’s patches of small intestine and appendix. The secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells.

There is lymphoid tissue also located within the lining of the major tracts (respiratory, digestive and urogenital tracts) called mucosa-associated lymphoid tissue (MALT). It constitutes about 50 per cent of the lymphoid tissue in human body.