Muscle tissue is contractile-can shorten and lengthen. When it does this it exerts a pulling force that causes movement, to revert to original length a pulling force must be exerted on the muscle. THis is usually provided by another muscle, so muscles work in pairs where one contracting causes other to lengthen -Muscles used to move the body are attached to bones and are called skeletal muscles. Under microscope can see stripes so are called striated muscle. What are adaptations of striated muscle cells?

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