<prompt> Rubor in inflammation is due to-Decreased tissue oncotic pressureDecreased hydrostatic pressure in aeriolesConstriction of the capillariesincreased blood flow  <response>: four cardinal signs of inflammation: rubor redness, tumor swelling, calor heat, and dolor pain. A fifth clinical sign, loss of function functio laesa, was added later The vascular and cellular reactions account for the signs and symptoms of the inflammatory response increased vascular permeability leading to the accumulation of extravascular fluid rich in plasma proteins, known as edema The redness rubor, warmth calor, and swelling tumor of acute inflammation are caused by the increased blood flow pain due to the release of chemicals such as bradykinin and histamine ref robbins 9th ed page 93 