The cardinal sign of inflammation called rubor is mainly the result of:
Inflammation can be defined as the reaction of vascularized living tissue to local injury. Celsus originally described four cardinal signs of inflammation: rubor (redness), tumor (swelling), calor (heat), and dolor (pain). Virchow later added a fifth sign, loss of function (functio laesa). Redness (rubor) and heat (calor) are primarily the result of increased blood flow, secondary to vasodilation of arterioles.
Decreased interstitial hydrostatic pressure
Decreased vascular permeability of capillaries
Increased vascular permeability of venules
Vasodilation of arterioles