Healing of the body is accomplished through restoration of damaged cells to normal function. It is the process by which cells regenerate and repair. Healing incorporates both the removal and replacement of damaged areas in the body.
Living organs will heal using a combination of regeneration and repair. Regeneration occurs when damaged cells are replaced by the same cell structure that was originally present. Repair is the process by which injured areas are replaced with scar tissue, a natural part of the body’s reaction to wounding or injury that is deeply correlated with healing.
In order for an injury to be healed by regeneration, the cell type that was destroyed will replicate. This process occurs by use of a cellular framework along which to grow known as collagen. Collagen is the main component of all connective tissue that guides cell growth. It continues to exist even when the cells around it are damaged.
The existing cells replicate, using the collagen framework as a guide, eventually bringing the damaged area of the body back to normal. After regeneration is complete, the damage to the original cell area is undetectable. Ultimately, a scar made of collagen containing a small number of assistive healing cells is left.