HEMATOCRIT
Hematocrit
Red blood cell count (RBC-count) is the number of erythrocytes in one liter of blood.Packed cell volume (PCV) is the percentage of erythrocytes in one liter of blood. Thus, PCV is a measure of the totalvolume of red blood cells in a sample, while RBC-count is the number of red blood cells in a sample, MCV- mean corpuscular volume is the mean volume of erythrocytes in a sample, thus:PCV = RBC-count x MCV
If you are given the volume, then you do not need to work it out!
in any given mm3 of blood, what is the approximate ratio of the number of red blood cells (erythrocytes) to white blood cells (leukocytes)
Red cells = erythrocytes White cells = leukocytes
Ther are equal numbers of red and white
Leukocytes are among the formed elements of blood. They fight infection and identify and neutralize other "foreign" invaders. The formed elements of blood are red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes).
Density
density
The mass of a substance in unit volume is its density.
Blood cells are predominantly red cells. They outnumber the white cells by a factor of 1000:1 to 2000:1 in normal humans. The composition of blood is 55% plasma and 45% formed elements. The formed elements are mostly red blood cells, which make up 44% of total blood volume. The remaining 1% consists of white blood cells and platelets. Appx. 700:1 Blood consists of formed elements (red blood cells, white blood cells and platelets) and plasma. Red blood cells (erythrocytes) account for 99.9% of cells. Plasma 55%, and Cells 45%.
density