<Li> Anemia <Ul> <Li> Insufficient red cell mass (anemia) can be the result of bleeding, blood disorders like thalassemia, or nutritional deficiencies, and may require one or more blood transfusions . Anemia can also be due to a genetic disorder in which the red blood cells simply do not function effectively . Anemia can be confirmed by a blood test if the hemoglobin value is less than 13.5 gm / dl in men or less than 12.0 gm / dl in women . Several countries have blood banks to fill the demand for transfusable blood . A person receiving a blood transfusion must have a blood type compatible with that of the donor . </Li> <Li> Sickle - cell anemia </Li> </Ul> </Li> <Ul> <Li> Insufficient red cell mass (anemia) can be the result of bleeding, blood disorders like thalassemia, or nutritional deficiencies, and may require one or more blood transfusions . Anemia can also be due to a genetic disorder in which the red blood cells simply do not function effectively . Anemia can be confirmed by a blood test if the hemoglobin value is less than 13.5 gm / dl in men or less than 12.0 gm / dl in women . Several countries have blood banks to fill the demand for transfusable blood . A person receiving a blood transfusion must have a blood type compatible with that of the donor . </Li> <Li> Sickle - cell anemia </Li> </Ul> <Li> Insufficient red cell mass (anemia) can be the result of bleeding, blood disorders like thalassemia, or nutritional deficiencies, and may require one or more blood transfusions . Anemia can also be due to a genetic disorder in which the red blood cells simply do not function effectively . Anemia can be confirmed by a blood test if the hemoglobin value is less than 13.5 gm / dl in men or less than 12.0 gm / dl in women . Several countries have blood banks to fill the demand for transfusable blood . A person receiving a blood transfusion must have a blood type compatible with that of the donor . </Li> <Li> Sickle - cell anemia </Li>

Who discovered the mechanism of circulation of blood in human body