Science
Immune system.
Definition
A complex network of cells, tissues, and organs that work together to defend the body against harmful pathogens and abnormal cells. It includes white blood cells, the lymphatic system, bone marrow, the thymus, and the spleen.
Examples
Real-world.
- 1 White blood cells patrolling the bloodstream for bacteria
- 2 Lymph nodes filtering lymph fluid and housing immune cells
- 3 The thymus gland training T cells to distinguish self from non-self