CBSE Class 10 Answered

The lymphatic system is the other transport system of human body. It is a complex network of lymphoid organs, lymph nodes, lymph ducts, lymph capillaries and lymph vessels that produce and transport lymph fluid from tissues to the circulatory system.

Lymph organs include the bone marrow, lymph nodes, spleen, and thymus. Precursor cells in the bone marrow produce lymphocytes. B-lymphocytes (B-cells) mature in the bone marrow. T-lymphocytes (T-cells) mature in the thymus gland. Human lymph nodes are bean-shaped.They may become enlarged due to a tumor or infection. WBCs are present in the lymph nodes. Lymph nodes are filters of lymph.