This academic textbook presents a structured introduction to the human immune system, focusing on the principles, components, and mechanisms that underlie immune responses. Written for higher education students in life sciences and medical fields, it explains both innate and adaptive immunity, detailing the roles of cells, molecules, and organs involved in defense against pathogens. The content is organized to build conceptual understanding progressively, supported by diagrams, examples, and educational features such as review questions and case studies. It also places immunological processes in a broader biological and clinical context, helping readers connect foundational science to health, disease, and medical applications.

Peter Parham

The Immune System