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Each muscle is made of many long. cylindrical fibres
7.1.3 Muscle Tissue
arranged in parallel arrays. These fibres are composed of
numerous fine fibrils, called myofibrils. Muscle fibres
contract (shorten) in response to stimulation, then relax
(engthen) and return to their uncontracted state in a
coordinated fashion. Their action moves the body to adjust
to the changes in the environment and to maintain the
positions of the various parts of the body. In general
muscles play an active role in all the movements of the body
Muscles are of three types, skeletal, smooth, and cardiac
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