hemoglobin is is found in blood plasma
A red blood cell contains about 200 million hemoglobin molecules. If all this hemoglobin was in the plasma rather than inside the cells, blood would be so thick that the heart would have a difficult time pumping it through.he thickness of blood is called viscosity. The greater the viscosity of blood, the more friction there is and more pressure is needed to force blood through the heart and vessels.Since hemoglobin is a respiratory pigment the efficiency of oxygen transport is high in this closed and packaged model of the red blood cell.