Describe the Lymphatic Organs in human biology?
The lymphatic organs include the lymph nodes, the spleen, the thymus gland, the tonsils, and Peyer's patches, all containing lymphocytes important in the immune response.
The lymph nodes are swellings located at intervals along the lymph vessels. The nodes are the sites where disease-fighting lymphocytes are manufactured. Lymph nodes also serve to filter foreign particles, damaged cells, and tissue debris; for this reason, they swell during an infection. You might recognize the expression "swollen glands," which refer to the swollen lymph nodes. Lymph nodes are especially numerous in the neck, armpits, and groin.
The spleen is the largest lymphatic organ, filtering particles from the bloodstream and storing blood in case of emergency. It contains large numbers of white blood cells, both lymphocytes and macrophages, which are discussed in the next section on the immune response.
The thymus gland was discussed previously as a part of the endocrine system. However, it also serves in the lymphatic system, promoting T-lymphocyte production during the development of the immune response. It is composed of lymphatic tissue.
The tonsils are also composed of lymphatic tissue, and are located at the back of the mouth. The lymphocytes inside the tonsils are part of the immune response within the mouth and throat, engulfing pathogens by phagocytosis. Like the lymph nodes, they swell during an infection - this may necessitate their removal by a tonsillectomy.
Peyer's patches are clusters of lymphatic tissue located in the small intestine.