6.0: Introduction
The immune system is an intricate defense mechanism that protects the human body from diseases and infection. It uses antibodies and white blood cells to combat foreign invaders such as bacteria and viruses. Maintaining a healthy immune system is essential for overall well-being and resilience against potential harm. This section of the chapter will discuss the immune system and its function, explain antigen-antibody interactions, and compare antibody-mediated and cell-mediated immunity.