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 termed as a kidney shaped organ of the lymphatic system. Lymph nodes perform an important role in proper functioning of the immune system. Lymph nodes become enlarged or inflamed in case of different diseases. The Condition of the lymph nodes is very crucial in cancer staging.

Complete Answer:
Lymph nodes occur throughout the body. Lymph nodes are composed of lymphocytes which are a type of white blood cell which includes B cells and T cells. Lymph enters a lymph node via multiple afferent lymphatic vessels. B cells develop antibodies which circulate within the bloodstream and on finding targets the antibodies bind to it and stimulate the immune response.
The antigen that occurs in cells enter the lymph system and then lymph nodes. They give the antigen to T cells. T cells are primarily used in cell- mediated immunity.

Now let us find solution from given options:
- Produce RBCs: Bone marrow is the primary site for the production of red blood cells. The formation of red blood cells is termed as erythropoiesis.
- Collect and destroy pathogens: The most important function of lymph nodes is the filtering of lymph to identify and fight infection. The lymph nodes filter harmful substances like bacteria and help to destroy them.
- Produce a hormone: Hormones are the chemical messengers that carry information and pour their secretion in ducts. The endocrine glands help to secrete hormones.
- Destroy the old and worn out red blood cells: Spleen is the primary site where destruction of red blood cells occur.

Hence the correct answer is option B.

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