scar

Scars are areas of fibrous tissue (fibrosis) that replace normal skin after injury. A scar results from the biological process of wound repair in the skin and other tissues of the body. Thus, scarring is a natural part of the healing process. With the exception of very minor lesions, every wound (e.g., after accident, disease, or surgery) results in some degree of scarring. An exception to this are animals with complete regeneration, which regrow tissue without scar formation.
Scar tissue is composed of the same protein (collagen) as the tissue that it replaces, but the fiber composition of the protein is different; instead of a random basketweave formation of the collagen fibers found in normal tissue, in fibrosis the collagen cross-links and forms a pronounced alignment in a single direction. This collagen scar tissue alignment is usually of inferior functional quality to the normal collagen randomised alignment. For example, scars in the skin are less resistant to ultraviolet radiation, and sweat glands and hair follicles do not grow back within scar tissues. A myocardial infarction, commonly known as a heart attack, causes scar formation in the heart muscle, which leads to loss of muscular power and possibly heart failure. However, there are some tissues (e.g. bone) that can heal without any structural or functional deterioration.

View More On Wikipedia.org

    Recent Content Tagged With scar

  1. Pro
  2. salem
  3. rambler
  4. 9c1ny
  5. Elements
  6. salem
    close
    Thread by: salem, Mar 3, 2017, 0 replies, in forum: Part & Accessory Classifieds
  7. OrdinaryJoe
  8. OrdinaryJoe
  9. Vxhybrid
  10. Vxhybrid
  11. Chandlerseattle
  12. salem
  13. Seth Urban
  14. Pro
  15. justinport05
  16. Hijeffrey95
  17. Humanhunter
  18. justinport05
  19. justinport05
  20. Cooper fan 88