Origin of immune cells Flashcards
1
Q
Where are all immune cells created and matured?
A
In primary lymphoid tissues where they are produced from haematopoietic stem cells.
2
Q
What happens once immune cells mature?
A
They leave the primary lymphoid tissues and enter the circulatory system.
3
Q
What can lymphocytes and some mononuclear phagocytes do?
A
They can recirculate between non-lymphoid tissues and secondary lymphoid tissues. This increases the likelihood that they will be exposed to pathogens picked up in tissue all over the body.
4
Q
What are the components of the primary lymphoid tissue?
A
Bone marrow and thymus.
5
Q
What are the components of the secondary lymphoid tissue?
A
Adenoid, tonsil, lymph node, spleen, appendix and Peyer’s patch in small intestine.
