Card Set Information
test 1 chapter 2
Organs are grouped into 2 main groups:
Primary and secondary lymphoid organs
primary lymphoid organs include:
bone marrow and thymus
secondary lymphoid organs include:
spleen and lymph nodes
There are tertiary lymphoid organs:
GALT, BALT, genitourinary system
**only have effector and memory cells**
formation and development of red and white blood cells
all blood cells arise form
hematopoietic stem cells (HSC)
Why are HSCs difficult to study? (2 reasons)
1. they are not abundant (1 in 50K cells)
2. difficult to grow in vitro
Hematopoiesis occurs at various sites throughout life.
Where does is occur the first week of development?
where does production decrease after adult stage?
liver and spleen
cranium, pelvis, sternum, ribs, vertebra, long bones
where are HSCs located?
from one cell, other types of cells can be formed.
can make only one kind of cell
HSCs differentiate into:
Lymphoid progenitor cells LPC
Myeloid progenitor cells MPCs