The immune system is comprised of the skin, the bloodstream (white blood cells), thymus (T cells and B cells), lymphatic system (lymoh nodes), spleen, and mucosal tissues (respiratory tract and gut.
These components help to prevent or limit infection. Each component and cells play a unique role, with different ways of recognizing problems, communicating with other cells, and performing their functions.
However, the immune system itself can fail and lead to Immune system disorders cause abnormally low activity or over activity of the immune system. In cases of immune system over activity, the body attacks and damages its own tissues (autoimmune diseases). Immune deficiency diseases decrease the body’s ability to fight invaders, causing vulnerability to infections.