The immune system is a host defense system comprising many biological structures and processes within an organism that protects against disease.
To function properly, an immune system must detect a wide variety of agents, known as pathogens, from viruses to parasitic worms, and distinguish them from the organism's own healthy tissue.
The lymphatic system is part of the circulatory system and an important part of the immune system, comprising a network of lymphatic vessels that carry a clear fluid called lymph directionally towards the heart.
Disorders of the immune system can result in autoimmune diseases, inflammatory diseases and cancer.
MicroLesson: One Minute Video Lecture - Coming Soon