All About Blood

Topics: Immune system, Blood, White blood cell Pages: 4 (1175 words) Published: February 16, 2013
Tell Me About Blood

1.) What is the significance of lower-than-normal hematocrit?
Lower-than-normal hematocrit indicates anemia. People with anemia do not have enough hemoglobin, which is the oxygen-carrying protein in red blood cells. Iron, B12, and folic acid deficiencies, some medications, and pregnancy can cause anemia. There are also more serious causes such as problems with the immune system that cause destruction of red blood cells earlier than normal, chronic diseases including kidney disease and cancer, and problems with bone marrow found in leukemia and lymphoma (MedlinePlus:Anemia, 2012). What is the effect of a bacterial infection on the hematocrit?

A bacterial infection, which raises white blood cell counts, may affect the hematocrit by lowering it. 2.) Compare the development of lymphocytes with the development of the other formed elements.

Lymphocytes and the other formed elements are developed from pluripotent stem cells. The pluripotent stem cells generate myeloid stem cells and lymphoid stem cells. Myeloid stem cells start and complete their development in red bone marrow and give rise to red blood cells, platelets, eosinophils, basophils, neutrophils, and monocytes. Lymphoid stem cells begin development in the red bone marrow, but some are completed in the lymphatic tissues, where they give rise to lymphocytes. The B cell lymphocytes are began and completed in the red bone marrow and the T cell lymphocytes begin in the red bone marrow, but they mature in the thymus (Jenkins, Kemnitz, & Tortora, 2010).

3.) What is erythropoiesis?
Erythropoiesis is the production of red blood cells or erythrocytes. It starts in the red bone marrow with a proerythroblast. The proerythroblast divides many times and produces cells that begin to make hemoglobin. A cell near the end of the development cycle ejects its nucleus and then becomes a reticulocyte. Reticulocytes pass from red bone marrow into the...
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