The immune system protects against the diseases; identifying pathogens (viruses to parasitic worms) and distinguishing from own body tissues. The immune system uses leukocytes (white blood cells) to destroy disease-causing organisms or substances. Thymus, spleen, and bone marrow are the lymphoid organs; it produces and stores Leukocytes.
The immune system consists of the thymus, spleen and lymphatic. The immune system is set of cells, tissues, and organs; works together to protect the body. Lymphatic is the secondary circulation system (part of immune system); it help to protect, cleanse, and to remove waste products.
Lymph nodes are present throughout the body; but large groups are on the breast, armpit, and groin.
1. The lymphatic vessels move lymph (a watery fluid containing protein, salts, glucose, urea, etc.) throughout the body and maintain body fluid level. It defends the body against illness-causing germs (viruses, bacteria, and fungi).
2. The thymus gland is part of the immune system; its main duty is during infancy and before puberty. It controls the growth and development of a major part of the immune system.
3. The spleen is part of the immune system; located in the upper left part of the abdomen under the rib cage. Major jobs of the spleen are white blood cells production and lymph fluid filtration. Macrophages in the spleen fight infection and protects the body. It destroys bacteria, dead tissues, and foreign substances; additionally, remove them from the blood.
4. Tonsils consist of two glands in the backside of the throat. The tonsils and adenoids (nasopharyngeal tonsils) protect the entry of the digestive system and the lungs, from bacteria and viruses. Adenoid is a patch of tissue; it protects kids and they disappear after age 5.