Links to other sites are provided for information only - they do not constitute endorsements of those other sites. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. This site complies with the HONcode standard for trustworthy health information: verify here. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. follows rigorous standards of quality and accountability. is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M. If a sample of blood is spun in a centrifuge, the formed elements and fluid matrix of blood can be separated from each other.īlood consists of 45% red blood cells, less than 1% white blood cells and platelets, and 55% plasma.Ī.D.A.M., Inc. The body makes about two million red blood cells every second!īlood is made up of both cellular and liquid components. The formation of a red blood cell takes about 2 days. If a stem cell commits to becoming a cell called a proerythroblast, it will develop into a new red blood cell. They give rise to all of the formed elements in blood. Stem cells in the red bone marrow are called hemocytoblasts. 2 Whole Blood and the Hematocrit What is the likely cause of a WBC count of 34K, in which most of the WBCs are lymphocytes How much water has been lost if a 12 lb infant decreases its weight by 0. Red blood cells are formed in the red bone marrow of bones. Blood Formation Erythropoiesis Erythropoiesis, the process of making erythrocytes, begins with the formation of proerythroblasts from hemopoietic stem cells. Their job is to transport oxygen to the body's tissues in exchange for carbon dioxide, which they carry to the lungs to be expelled. Red blood cells are an important element of blood. Blood has been called the river of life, transporting various substances that must be carried to one part of the body or another.
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