The study of the <answer>molecular and cellular components</answer> that comprise the immune system, including their function and interaction, is the central science of immunology. The immune system has been divided into a more primitive innate immune system and, in vertebrates, an acquired or adaptive immune system. The latter is further divided into humoral (or antibody) and cell-mediated components.
The total immune system is generally composed of what types of structures?
molecular and cellular components