Final answer:
The inflammatory response is an immune reaction triggered by any tissue injury, featuring the classic signs of redness, warmth, swelling, and pain due to the increased blood flow and vessel permeability.
Step-by-step explanation:
The inflammatory response is a fundamental aspect of the immune system's defense mechanism, activated by any tissue injury. It is characterized by a sequence of events that include vasodilation, increased blood flow, and fluid leakage into tissues, causing redness, warmth, swelling, and pain. The goal of the response is to isolate and eliminate the cause of the injury, be it a pathogen or damaged cells, and to begin the healing process. The release of chemicals like histamine, leukotrienes, and prostaglandins from injured cells and immune cells like mast cells and basophils leads to increased blood vessel diameter, blood flow, and permeability which are essential to this protective response.