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| | Muscular System, number of muscles in the human body, types of muscle . . . |
 | | The muscles surrounding your eye are the busiest muscles in your body. |
 | | Each muscle belongs to one of three categories: skeletal muscles, which move bones - smooth muscles, which control involuntary movements such as breathing and digestion, - and cardiac muscle, which is found in the heart. |
 | | Involuntary muscle tissue is found in the internal organs; namely the digestive tract, respiratory passages, urinary and genital ducts, urinary bladder, gallbladder, walls of the blood vessels. |
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