Question

The chief function of lymph nodes in mammalian body is to
A) Produce RBCs
B) Collect and destroy pathogens
C) Produce a hormone
D) Destroy the old and worn out red blood cells

Answer 1

Hint:Lymph node is defined as a kidney shaped organ of the lymphatic system. Lymph nodes play an important role in proper functioning of the immune system. Lymph nodes become enlarged or inflamed in various diseases. The Condition of the lymph nodes is very important in cancer staging.

Complete answer:
Lymph nodes are present throughout the body. Lymph nodes have lymphocytes which are a type of white blood cell which includes B cells and T cells. Lymph enters a lymph node through multiple afferent lymphatic vessels. B cells produce antibodies which circulate throughout the bloodstream and on finding targets the antibodies bind to it and stimulate the immune response.
The antigen presenting cells enter the lymph system and then lymph nodes. They present the antigen to T cells. T cells are involved in cell- mediated immunity.
The primary function of lymph nodes is the filtering of lymph to identify and fight infection. The lymph nodes filter harmful substances like bacteria and cancer cells from your body and help in fighting against infections. So the lymph nodes collect and destroy pathogens.

Hence the correct answer is option ‘B’.

Note: The enlargement or swelling of lymph nodes is called lymphadenopathy. The swelling can be due to many causes such as infections, tumors, autoimmune disease and many other reasons. A lymph node consists of lymphoid tissue which is a meshwork of fibers called reticulum with white blood cells in it.