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Energy and the Body. Energy - the capacity or ability to perform work.For our bodies to perform work, our muscles must contract (shorten). For example:Smooth muscle in our digestive system contracts to allow food to be processed; Cardiac muscle in our heart contracts to allow the heart to beat; Skeletal muscle contracts to allow us to perform mechanical work.The body breaks down foods via chemical reactions, thereby releasing chemical energy. These reactions, and the energy they create, t9447

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