What tissue repair process forms scar tissue?
When tissue damage occurs, it stimulates the body’s inflammatory and immune responses, and the healing process begins almost immediately. Inflammation is a non-specific body response that attempts to prevent further injury. Immune response is extremely specific and amounts to a vigorous attack against recognized invaders. Tissue repair, wound healing, occurs in two major ways: • Regeneration is the replacement of destroyed tissue by the same kind of cells. • Fibrosis involves repair by dense (fibrous) connective tissue by the formation of scar tissue. Which of these occur depends on (1) the type of tissue damaged and (2) the severity of the injury. Tissue injury sets a series of events into motion: • Broken blood vessels at the wound site bleed, releasing inflammatory chemicals into the extracellular space. • Local blood vessels dialite and become more permeable, allowing white blood cells, fluid, and plasma proteins to enter the injured area. • Clotting proteins (leaked from the blood
