To function correctly, a healthy immune system must adhere to four essential principles:
: An overreaction to harmless environmental substances. Immunology
: The ability to limit or shut down the immune response once the threat is neutralized to prevent tissue damage. 3. Clinical Importance and Future Directions To function correctly, a healthy immune system must
Immunology is the branch of biomedical science that explores the complex network of cells, tissues, and organs that constitute the immune system. Its primary function is to protect the host from pathogens such as bacteria, viruses, and parasites while maintaining a delicate balance of "self-recognition" to avoid attacking the body's own tissues. This essay explores the fundamental principles of immunity, the distinction between its two primary arms, and the importance of this field in modern medicine. 1. The Two Arms of the Immune System Clinical Importance and Future Directions Immunology is the
: Distinguishing the host's own cells ("self") from foreign elements ("non-self").