What are various elements in an immune system?

Immune system:

1. The human immune system is made up of different immune cells, tissues and organ structures that control the attack against foreign invaders.
2. Immune cells that act against antigens are white blood cells comprising neutrophils, eosinophils, basophils, lymphocytes, monocytes and macrophages.
3. The thymus, bone marrow, lymph nodes and the spleen are the organs that produce the immune cells.
4. Antibodies are the protein molecules produced against the antigens that can control the effect of those antigens in the body.