An official definition of indigenous has not been adopted by the UN system due to the diversity of the worldâs indigenous peoples. Instead, a modern and inclusive understanding of indigenous has been developed and includes peoples who:
Thymus. The thymus gland is the main organ of the lymphatic system. Located in the upper chest region, the primary function of this gland is to promote the development of specific cells of the immune system called T lymphocytes.nce mature, these cells leave the thymus and are transported via blood vessels to the lymph nodes and spleen. T lymphocytes are responsible for cell mediated immunity, which is an immune response that involves the activation of certain immune cells to fight infection.
The thymus produces and secretes thymosin, a hormone necessary for T cell development and production. The thymus is special in that, unlike most organs, it is at its largest in children. Once you reach puberty, the thymus starts to slowly shrink and become replaced by fat.hymus Essentials. 1  The thymus gland, located behind your sternum and between your lungs, is only active until puberty. 2  After puberty, the thymus starts to slowly shrink and become replaced by fat. 3  Thymosin is the hormone of the thymus, and it stimulates the development of disease-fighting T cells.