IMMUNOLOGY

Detailed explanation-1: -Lymph nodes are small, bean-shaped masses of lymphatic tissue along lymph vessels. They store lymphocytes and filter waste, bacteria and damaged cells (including cancer cells) from lymph.

Detailed explanation-2: -The palatine (or faucial) tonsils, commonly referred to as tonsils, are bundles of lymphatic tissue located in the lateral oropharynx.

Detailed explanation-3: -Tonsils: these are clusters of lymphatic tissue under the mucous membrane lining of the nose, mouth, and throat. Lymphocytes and macrophages in the tonsils provide protection against foreign substances and pathogens that enter the body through the nose or mouth.

Detailed explanation-4: -The spleen acts as a filter. It weeds out old and damaged cells and helps control the amount of blood and blood cells that circulate in the body. The spleen also helps get rid of germs. It contains white blood cells called lymphocytes and macrophages.

Detailed explanation-5: -In humans, the term is used to designate any of three sets of tonsils, most commonly the palatine tonsils. These are a pair of oval-shaped masses protruding from each side of the oral pharynx behind the mouth cavity. The exposed surface of each tonsil is marked by numerous pits that lead to deeper lymphatic tissue.

Detailed explanation-6: -They occur in large numbers in the blood and lymph (the colorless fluid in the lymphatic vessels that connect the lymph nodes in the body to each other and to the bloodstream) and in lymphoid organs, such as the thymus, lymph nodes, spleen, and appendix (Figure 24-3).

Detailed explanation-7: -Tonsils are large partially-encapsulated masses of lymphoid tissue, found in the walls of the pharynx and nasopharynx, and at the base of the tongue. They form an incomplete ring around the gastrointestinal and respiratory tracts, where they cross over.