Muscle - is a body tissue that works together in groups to produce movement., Voluntary - you think about contracting them and your nervous system tells them to do so, Skeletal  - muscles attach to the skeleton and come in pairs -- one muscle to move the bone in one direction and another to move it back the other way, Smooth - muscle found in the digestive system that has the ability to stretch and maintain tension for long periods of time, Involuntary - you do not have to think about contracting it because your nervous system controls it automatically., Cardiac  - muscles found only in your heart, and its big features are endurance and consistency.,

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