MCP 33: Hematopoiesis Flashcards
hematopoiesis
how blood cells mature
the production of blood cells during the first trimester
in yolk sac, primordial RBCs
the production of blood cells during the second trimester
liver-spleen-thymus, RBCs, precursor granulocytes and megakaryocytes
the production of blood cells during the third trimester
bone marrow and lymph nodes produce all blood types
hematopoiesis in adulthood
by age 25, the axial skeleton is now the primary producer of these blood cells, not the long distal bones
what happens as morphological characteristics increase
potentiality and self-renewing capabilities decrease
role of mitosis in hematopoiesis
increases until mature blood cells, which don’t divide
role of growth factors in hematopoiesis
growth factors are important at
all the stages, in particular progenitor
and precursor/-blasts
differentiated activity in blood cells
only present in mature cells
red marrow
highly vascular and more active, hematopoietically speaking, becomes replaced by adipose tissue with age
venous sinusoids
provide a highway through bone to allow the mature blood cells to exit into the vasculature
stromal cells
support hematopoiesis in bone marrow by secreting growth factors that help in development of blood cells
erythropoiesis
1) size decreases, 2) hemoglobin increases, 3) ratio of mitochondria to RNA decrease and 4) Purple/blue colored nucleus becomes red/pink.
erythropoietin
kidneys detect low blood oxygen levels, EPO secreted into blood, stimulated RBC growth at the progenitor level, increasing oxygen delivery to tissues , acts on Pro-erythroblast
stages of erythropoiesis
Pro- erythroblast, Basophilic Erythroblast, Polychromatophilic Erythroblast, Normoblast, Reticulocyte, Erythrocyte