immune system
13 questions tagged immune system — spanning every one of the seven Ws.
Why do we have tonsils?
Tonsils are immune tissue that samples germs entering the mouth and nose, helping the body build defences.
Which blood cells fight infection?
White blood cells, or leukocytes, fight infection by attacking germs, making antibodies and cleaning up damaged cells.
What is the thymus?
The thymus is a gland in the chest where T cells mature for the immune system. It is especially active in childhood and gradually shrinks after puberty.
What is the lymphatic system?
The lymphatic system is a network of vessels, nodes, and organs that helps drain tissue fluid and support immunity. It returns excess fluid to the bloodstream and helps fight infection.
Where is the spleen located?
The spleen is in the upper left abdomen, beneath the ribs and behind the stomach. It helps filter blood and support the immune system.
Where are the Peyer’s patches located?
Peyer’s patches are located in the small intestine, mainly in the ileum. They are clusters of lymphoid tissue that help monitor gut bacteria.
Which is the largest lymphoid organ in the human body?
The spleen is the largest lymphoid organ in the human body. It filters blood, helps immune defense, and stores blood cells.
Which is the largest lymph node region in the human body?
The neck contains the largest concentration of lymph nodes in the body. These nodes help filter lymph and coordinate immune responses.
Whose discovery first described the spleen's immune role?
Pieter van Leeuwenhoek made early observations that helped reveal blood cells and microscopic life, but later researchers established the spleen's immune function. The organ is now known as a key part of immune surveillance and blood filtration.
How do white blood cells find and attack germs?
White blood cells detect chemical signals from infections, then move toward the threat and destroy microbes or infected cells. Different types do different jobs, from engulfing bacteria to making antibodies.
What are the tonsils?
The tonsils are lumps of immune tissue in the throat that help trap germs entering through the mouth and nose.
Where is the thymus located?
The thymus is located in the upper chest, behind the breastbone and in front of the heart. It is especially active during childhood.
Whose name is attached to the cluster of immune tissue in the back of the throat that helps fight infection?
Waldeyer is associated with Waldeyer’s ring, a ring of lymphoid tissue in the throat that includes the tonsils.