Tell me about blood

1. Hematocrit is what measures the red blood cells in blood. Red blood cells are important for transporting iron and oxygen and for creating energy. If the red blood cell count is lower-than-normal it could indicate several diseases and problems within the body. It may be due to anemia, bleeding, destruction of red blood cells, leukemia, malnutrition, low iron, folate, vitamin B12 and vitamin B6 or overhydration. A bacterial infection causes white blood cells to increase, since they are the cells that attack and destroy the bacteria. As the white blood cells increase, red blood cells decrease.
2. All formed elements begin in red bone marrow as pluripotent stem cells. Pluri means several and these type of stem cells have the ability to turn into many different types of cells. For formed elements pluripotent cells reproduce in the bone marrow and become two different types of cells: myeloid stem cells and lymphoid stem cells. While myeloid stem cells complete development in the red bone marrow and create the majority of formed elements in the blood, lymphoid stem cells finish up in the lymphatic tissues of the body. From there lymphocytes are created and all formed elements, including lymphocytes, are swept into the blood stream to complete their jobs. However, lymphocytes divide once they leave the marrow, while other formed elements do not.
3. Erythropoiesis is the creation of red blood cells. The making of red blood cells (RBCs) starts in the red blood marrow with another cell called a proerythroblast. The proerythroblast is basically an immature red blood cell. As they mature they then become a reticulocyte. A reticulocyte is the middle, or “teenage,” stage of a RBC. One it fully matures it becomes an erythrocyte. The rate of RBC production is regulated by the percentage of reticulocytes versus RBC circulating. Erythropoiesis is controlled directly by the amount of oxygen carried to the kidneys. If the kidneys are not receiving enough oxygen to distribute to the