Final answer:
Mast cells trigger a response to injury during the inflammatory phase of repair. When mast cells are irritated or damaged, they release histamine and other inflammatory mediators, causing vasodilation and inflammation at the site of injury. This inflammatory response is followed by the migratory phase of repair, where fibroblasts migrate to the injury site and deposit collagen.
Step-by-step explanation:
Mast cells trigger a response to injury during the inflammatory phase of repair.
When mast cells are irritated or damaged, they release histamine, which causes vasodilation and increased blood flow at the site of injury. This leads to redness, swelling, and itching, which are signs of inflammation. Mast cells also release other inflammatory mediators such as heparin.
Inflammation is an essential part of the body's response to injury, as it helps to remove pathogens and damaged cells and promotes the healing process. The migratory phase of repair follows the inflammatory phase, during which fibroblasts migrate to the site of injury and deposit collagen to rebuild the damaged tissue.