Why do skin cells heal fast?
Thick of it like this: all that protects your internal organs, muscles, and bones, is a thin layer of cells and hair. Skin has to heal fast in order to protect the inner body.
The skin cells on the surface (or dermis) are dead. They form a protective covering. When they are lost due to injury, the body generates new skin cells to replace this. The lower layer of skin is called the epidermis and it consists of actively dividing cells. When there is injury, cells must grow fast to heal the wound
injuries to the skin heal faster than injuries in the brain because of cell division. When your skin cuts it heals faster then when something happens to your brain because your skin cells wear out quickly, so they need to be replaced often. That's why it is faster to heal than injuries to the brain :)
Skin cells divide really quickly because our skin needs a constant renewal of cells. Our skin becomes worn-out, and the life-span of a skin cell isn't even that long, so our skin cells divide really quickly to replace the dying and or worn-out skin cells. If our skin cells didn't divide that quickly, there would be many places where we would be bleeding because our skin cells couldn't divide fast enough to keep the blood…
What happens to the cells at the edges of an injury when a cut in the skin or break in a bone occurs?
Skin injuries typically heal using regeneration in which the dead or damaged cells are replaced by identical cells, while more severe injuries may heal using fibrosis. Fibrosis will not restore the function of the lost cells, however, the scar tissue is capable of holding the organ together. Therefore, regeneration is more desirable.
Your bones are designed for getting fractured. They unite readily, specially in case of children. Muscles also heal fast when stitched well. You are unfortunate in that the nerve cells heal poorly or do not heal at all. But then the nerve damage is rather uncommon in clinical practice, except in few instances.
Cells cannot live forever. They grow old, especially in multicellular organisms like us, and need to be replaced. Mitosis is a way to make new cells. One cell, the mother cell, divides into two daughter cells. The daughter cells are identical copies of the mother cell. Mitosis is happening all the time in your body. For example, it is what allows your skin to heal after you cut yourself. The cells beneath the epidermis (the…