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The body follows a 3 stage process when it repairs a torn muscle or tendon.

Once the bleeding stops, it forms a clot that will play an important part in the healing process. Not all muscle tears cause visible bruises – you will only see a bruise if the dead blood moves close to the skin before it is absorbed. You will usually also tear some of the blood vessels, which is why you may see a bruise appear a few days after injuring yourself. The strain may also affect your tendon and the research has shown that any muscle injury where the tendon has also torn usually takes a lot longer to heal. The more fibers you tear, the more serious your injury is and the longer it will take to recover. When you strain a muscle, you tear some of the muscle fibers. What happens when you pull or strain a muscle? Tendons are mainly made up of collagen fibers and they don’t have such a good blood supply compared to muscle tissue. The muscle cells all receive a good blood and nerve supply via several arteries, veins, and nerves that thread through the muscle. These bundles are held together by layers of fascia (that white sinewy stuff in meat) and the muscle itself is also surrounded by a thick layer of the fascia. Muscles are made up of lots and lots of muscle cells that are grouped together in bundles.