Immune system: The
body's system for protecting itself from viruses and bacteria or any
The immune system protects the body against invading microbes
such as bacteria, viruses and parasites.
Some of the general front-line immune defences are the skin and various membranes,
but a variety of internal organs and cells provide very specific defences.
Organs involved in this process include white blood cells
(T-cells and B-cells), thymus (matures T-cells), bone marrow (produces WBCs),
tonsils (protect the throat), lymph nodes, and the spleen.
Other defensive body processes include stomach acid, various cleaning secretions
(e.g. tears, saliva, vaginal secretions, etc.),
nasal hairs, mucus in the throat and respiratory system, and
cilia in the mucus.
Although the immune system usually prevents disease,
sometimes it can cause it.
There are several diseases caused by an overactive immune system
such as allergies, asthma, autoimmune diseases (more than 100),
and hay fever.
Introduction: immune system — a complex network of specialized
cells, tissues, and organs that defends the body against attacks by
disease-causing microbes. 2Condition count:
; see list below.
Organ subtypes:skin (90), white blood cells (5), thymus gland (3), bone marrow (9), tonsils (7), spleen (3), lymph nodes (9), macrophages (0)
Main condition: Immune disorders
Organs:all organs Diseases list:
The following list of medical conditions
have 'Immune system' or similar listed as an affected body part
in our database: