http://www.adamsavenuedesign.com/bone-white/
what's the difference between white/yellow bone marrow and red bone marrow?
what cells are present in each one?
This may help:
Describe the process of hemopoiesis. Identify its location and the role of
hemopoietic stem cells.
Hemopoiesis is the production of formed elements from stem cells. Hemocytoblasts
produce myeloid stem cells (which produce RBCs and several classes of WBCs) and
lymphoid stem cells (which produce lymphocytes).
RBC are produced by myeloid stem cells in myeloid tissue (red bone marrow). Myeloid
stem cells in myeloid tissue also produce all the classes of WBCs except for lymphocytes.
Lymphocytes are produced by lymphoid stem cells in lymphatic tissues and myeloid
Distinguish among the formed elements of the blood. Describe their numbers,
characteristics, functions, production. Discuss each of the following: erythropoietin,
reticulocytes, hemoglobin, bilirubin, transferrin, granulocytes, agranulocytes,
differential count, emigration, megakaryocytes.
Formed elements:
• Red blood cells (RBCs or erythrocytes) - most abundant, 99.9% of formed elements;
transport respiratory gasses
• White blood cells (WBCs or leukocytes) - defend against pathogens and remove
toxins, wastes and damaged cells
• Platelets - small cell fragments that contain enzymes for clotting
Erythropoietin - hormone formed in the kidneys and liver; released when oxygen
concentrations are low; increases RBC formation up to 10 time the normal rate
Reticulocytes - immature RBCs that have lost their nucleus; they leave the bone marrow
and enter the bloodstream
Hemoglobin - protein in RBCs that binds oxygen and carbon dioxide
Bilirubin - product of hemoglobin breakdown that is filtered from blood by the liver and
excreted in bile
Transferrin - plasma protein that binds to iron in blood; absorbed by developing RBCs
in bone marrow
Granulocytes - classes of WBCs whose lysosomes and secretory vesicles are
microscopically visible granules; includes neutrophils, eosinophils & basophils
Agranulocytes - classes of WBCs whose lysosomes and secretory vesicles are not
microscopically visible; includes monocytes and lymphocytes
Differential count - the number of each type of WBC in a sample of 100 WBCs
Emigration - the process of WBCs leaving the bloodstream by squeezing between the
endothelial cells of blood vessel walls
Megakaryocytes - originate from myeloid stem cells and produce platelets
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