Figure 50-37 Blood rheology: relationship between viscosity and shear rate in the blood of healthy volunteers reconstituted to hematocrit (hct) values of 0%, 20%, 40%, 60%, and 80% at a temperature of 37°C. (Redrawn from Rand PW, Lacomb E, Hunt HE, Austin WH: Viscosity of normal human blood under normothermic and hypothermic conditions. J Appl Physiol 19:117, 1964.)