CH. 4 Flashcards
how many active genes do we have
around 300 million
what cell do all WBCs come from
hemocytoblast
where in the embryo does mesoblastic hematopoietic phase occur
yolk sac
where in the fetus does medullary hematopoietic phase occur
bone marrow
what do you call a human that is 0 to 2 months old
embryo
what do you call a human that is 2-9 months old
fetus
where is the origin of primitive erythroblast
yolk sac
what has a higher affinity for O2 fetal hemoglobin or maternal Hgb
fetal
what is the normal ratio of myeloid cells (WBCs) to RBC
3 :1
why are there more RBCs than WBCs
RBCs live a lot longer
what kind of bone marrow do kids have
only spongy red marrow
what is in the medullary cavity
yellow marrow and spongy red marrow
what are the primary tissues of lymphoid development
bone marrow and thymus
after the bone marrow where do T- lymphocytes go
thymus
what are the secondary tissues of lymphoid development
spleen and lymph nodes
where in the bone marrow do hematopoietic cells exit
sinus
what is the formula for % cellularity
= 100 - age
what kind of anemia has hypocellular bone marrow
aplastic anemia
what do megakaryocytes release
platelets
what does the liver produce
bile and cholesterol
what does bile contain
bile salts and bilirubin
what type of cells are kupffer cells
macrophages
what did the spleen originate from
lymphnode
function of the spleen
filters blood
what cells are mostly found in white pulp in the spleen
WBCs and antigen presenting cells
if a RBC enters the red pulp does it exit quickly or slowly
quickly
if a RBC enters the white pulp does it exit quickly or slowly
slowly
splenomegaly
enlarged spleen
def? autosplenectomy
dead spleen
where in the body are there NO lymph nodes
CNS and bone marrow
what kind of cells are in the cortex of a lymph node
antigen presentingcells
where is the site of T cell maturation
thymus
what theory about stem cells is correct
monophyletic
what diffrentants a stem cell
environmental cues
