Cell injury can lead to inflammation, cell death, and healing responses that aim to restore normal structure and function. There are two main types of wound healing - primary union which involves clean surgically incised wounds healing within 5 days through hemorrhaging, acute inflammation, epithelial changes, and collagen formation. Secondary union occurs with open wounds and large tissue deficits, involving longer inflammatory and granulation tissue formation phases before wound contraction over 14 days leads to scar tissue formation and healing. Factors like infection, blood supply, foreign bodies, movement, age, nutrition, and diseases can influence the wound healing process and potentially lead to complications.
