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In many cases the knot in the muscle is caused by an abnormal nerve message being sent to the muscle. The abnormal nerve message is, in turn, caused by a misaligned bone in the spine that irritates the nerve. To keep it simple.
Types of Muscles. 1  Skeletal Muscles-These are the muscles we use to move around. 2  They cover our skeleton and move our bones. 3  Sometimes they are called striped muscles because they come in long dark and light bands of fibers and look striped. These muscles work without us having to think about them. 2  Cardiac Muscle-This is a special muscle that pumps our heart and blood through our body. 3  Shivering is caused by hundreds of muscles expanding and contracting to produce heat and make us warmer.