ABSTRACT
The immune and lymphatic systems are two closely related organ systems that share several organs and physiological functions (Figure 19.1). The immune system is the defense system against infectious organisms (such as bacteria and viruses) and foreign materials. Through a series of molecular binding and signaling events mediated by circulating blood cells, the immune system can recognize, attach to, and destroy these invasive factors (also called pathogens), preventing local or systemic infection and preventing disease. Hence, in order to understand the body response to an implanted material, it is essential to study the immune system of the body [1].
