Two features of cardic muscle fibre?
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The regular organization of myofibrils into sarcomeres gives cardiac muscle cells a striped or striated appearance when looked at through a microscope, similar to skeletal muscle. These striations are caused by lighter I bands composed mainly of a protein called actin, and darker A bands composed mainly of myosin.
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- Cardiac muscle fibres are involuntary muscles that contract rapidly, but do not get fatigued.
- The cells of cardiac muscle fibres are cylindrical, branched, and uninucleate.
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