how muscles heal themselves
One method the body uses to heal itself is by scarring. This generally occurs with injuries that penetrate the skin and/or muscle tissue. First, your white blood cells knit together to form a clot that stops the blood from leaving your body. Then, a protein called collagen forms at the site of the injury to repair the damage. In fact, this is the same type of tissue that was there originally, but the difference is in the way it forms.