I saw your post about blood central earlier on, Antonia, I tried to Google, but nothing came... I guess it has to do with the main blood flood, but I don't have a clue as to what it means...
Central blood constitutes the volume of blood in the lungs, heart, and great vessels. (This amount plus blood in small veins, venules and capillaries become total body's blood.)
Central blood stream is analogous to heavy traffic on the freeway system in a city, whereas blood stream in small veins, nenules and capillaries (tiny vessels bringing blood to/from tissue