Final answer:
An immune response characterized by increased blood flow, redness, warmth, swelling, and pain is termed inflammation, and the redness is specifically caused by the increased blood flow. Fever is a systemic response and is not a localized sign of inflammation.
Step-by-step explanation:
The immune response to injury characterized by increased blood flow, redness, warmth, swelling, and pain is known as inflammation. When tissue is injured or infected, the inflammatory response is a basic innate immune response that acts to prevent the spread of infection and to begin the healing process.
The redness associated with inflammation is directly caused by increased blood flow to the affected area, which is a response meant to deliver more immune cells to the site of injury or infection. On the other hand, fever, which is not a localised sign but a systemic one, is characterized by an overall increase in body temperature to help fight off pathogens. Fever is therefore not a cardinal sign of local inflammation unlike redness, heat, swelling, and pain.