Body system
Immune system
Systema immunitatis
- Function
- Defends against germs, foreign substances and abnormal cells, and remembers some past encounters.
- Includes
- White blood cells, antibodies, bone marrow, thymus, spleen and lymph nodes.1
Organs of this system
Educational illustrations, not medical images.
A short overview linking this part to related content.
Conditions that affect it
Related to
Includes
Specialty
References
- 1MedlinePlus / NLM. Immune System and Disorders. medlineplus.gov/immunesystemanddisorders.htmlHealth agencies & guidelines · Accessed 2026-10-03