Tissue: A group or layer of cells that perform specific functions. For example, muscle tissue is a group of muscle cells.issue: A group or layer of cells that perform specific functions. For example, muscle tissue is a group of muscle cells.
1 The skin is a barrier to the outside world protecting the body from infection, radiation, and extremes of temperature.  There are many types of wounds that can damage the skin including abrasions, lacerations, rupture injuries, punctures, and penetrating wounds.
- generally puncture wounds do not cause serious external bleeding but there may be significant internal bleeding and damage to vital organs. 4. Incision â an open wound with clean, straight edges usually done with a sharp instrument. 5. Avulsion â involves tearing off or loss of a flap of skin. collection of blood under the skin and tissue. B. Open Wounds â are injuries with break in the skin or mucous membrane 1. Abrasion â superficial loss of skin resulting from rubbing or scraping the skin over a rough or uneven surface 2. Laceration â tear in the skin that can be partial or full thickness cut.