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Cardiac muscle, only located in the heart, is especially efficient at contracting consistently over a lifetime. Contractions are involuntary, the force exerted is the same as with skeletal muscle, at a fast speed. Smooth muscle is used in blood vessels, airways, the uterus, bladder and digestive system. This type of muscle is able to stretch and remain contracted for protracted periods of time. As with cardiac muscle contraction is controlled involuntarily by the central nervous system. Skeletal muscles are often the muscles people want to produce or loose fat to then be able to see. Frequent exercise benefits the other muscles, notably creating larger and stronger heart muscles. Fast contracting skeletal muscle functions anaerobically, slow contracting skeletal muscle works in an aerobic environment.