The myofibrils are bundles of interconnected protein filaments of striated muscles. The filaments (myofilaments) included in the myofibrils are mainly thick filaments (myosin), and thin filaments (actin). The contractile functional unit of the myofibril is called the sarcomere.
The myofibrils have a characteristic banding pattern detected under a light microscope referred to as striations.
The main function of the myofibrils is to produce muscle contraction and relaxation.
|Definition||Bundles of interconnected protein filaments of striated muscles|
|Function||Muscle contraction and relaxation|
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