Immune system

The immune system responds to antigens by producing cells that directly attack the pathogen, or by producing special proteins called antibodies Antibodies

The immune system is the body's tool for preventing or limiting infection Its complex network of cells, organs, proteins, and tissues

excretory system 70% of the immune system is located in the gut, where diverse bacteria is best

skeletal system Organs and tissues Organs and tissues important to the proper functioning of the immune system include the thymus and bone marrow, lymph nodes and vessels,