Thymus: Define

The thymus is a small organ located in the upper chest, behind the breastbone. It is a primary lymphoid organ of the immune system where T cells mature and differentiate. The thymus plays a crucial role in the development and maintenance of a healthy immune system by producing and releasing T cells, which are essential for the body's defense against infections and diseases.

The thymus is a lymphoid organ located in the mediastinum of mammals. It is responsible for the development and maturation of T lymphocytes, which are essential for cell-mediated immunity. The thymus is most active during childhood and adolescence, but it gradually involutes with age.