Body temperature = 32.78C (91F) Heart rate = 242 bpm Blood pressure = 80/40
Vulcan blood vessels are more dilated than Humans. The larger blood vessels are the reason Vulcan blood pressure is lower. The dilated blood vessels and fast heart rate also play a key role in regulating Vulcan body temperature. A standard 91F body temperature is maintained by the internal cooling mechanism of fast blood circulation.
Vulcans do not have sweat glands, and cannot rely on evaporation as a means of cooling their bodies in the harsh heat of their planet’s desert climate. Expelling heat through radiation is insufficient. Vulcans evolved an internal cooling mechanism. With an average body temperature of 91F (ST reference: Star Fleet Medical Reference Manual), the high blood flow circulates cool blood throughout their body. This systematic means of cooling gives credence to McCoy’s comment “that green ice water you call blood” (TOS episode: "The Paradise Syndrome")"