What makes up the immune system?

Cells,tissues,organs. The immune system is a network of cells, tissues, and organs that work together to defend the body against attacks. Lymphoid organs (produce white blood cells that fight invading organisms) found throughout body, in bone marrow, thymus gland, lymph nodes, tonsils, appendix, lining of digestive tract and lungs.

Related Questions

What types of cells make up the immune system besides the leukoplakia?

Not Clear? Leukoplakia are patches on the tongue, in the mouth, or on the inside of the cheek that happen because of irritation. They are not cells of the immune system. Read more...
Leukocytes? I think you mean leukocytes, which are white blood cells and include macrophages, neutrophils, mast cells, eosinophils, and basophils. Lymphocytes are also cells of the immune system and include b cells and t cells which are derived from hematopoietic stem cells in the bone marrow . Read more...
Reference Site. http://www.ncbi.nlm.nih.gov/pubmedhealth/pmh0002041/. Read more...