How do capillaries and epithelial cells contribute to wound repair?

Capillaries and epithelial cells play essential, distinct roles in the complex biological process of wound repair.

The Role of Capillaries

Capillaries are vital for restoring circulation to damaged areas. During the repair process, endothelial cells—which form the walls of capillaries—give rise to new blood vessels through a process known as angiogenesis. This vascularization is critical because it supplies the oxygen and nutrients necessary for tissue regeneration. Furthermore, during injury or infection, capillary walls become more permeable, allowing immune cells and proteins to enter the wound site to support healing and manage the inflammatory response.4123

The Role of Epithelial Cells

Epithelial cells are key to the superficial closure of a wound. These cells, which are capable of proliferation, begin to multiply and spread from the edges of the wound. They move across the wound surface, often clearing a path beneath the scab by producing enzymes that dissolve the crust. Eventually, these proliferating epithelial sheets from opposite sides of the wound meet and coalesce, effectively sealing the surface and restoring the protective barrier of the skin or mucous membranes.45