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Muscle Tissue - Muscle Tissue Muscle tissue is a tissue...

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Muscle Tissue Muscle tissue is a tissue characterized by cells that convert the chemical energy of ATP into mechanical energy -- that is they use energy to shorten. There are three types of muscle tissue: skeletal, cardiac and smooth muscle. This lesson will focus on skeletal muscle, with a brief discussion of how cardiac and smooth muscle tissues differ from skeletal muscle. In general, the functions of the muscular system relate to movement of the body. This includes gross movements and stability of the body, as well as the movement of internal substances . When muscles contract, the energy released by the hydrolysis of ATP to contract is inefficiently used; the excess heat is released as heat, which can be transported throughout the body by the blood. Excess heat is removed by dilation of cutaneous arteries. Muscle Cells Regardless of type, all muscle cells are excitable , conductive , contractile , extensible , and elastic . Excitability refers to the ability of muscle cells to respond to stimuli . In skeletal muscle, the
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