Fill it he blanks with the suitable words The thick filaments in the \'A\' band are also held together in the middle of this and by a thin fibrous membrane called (a)_____. The \'A\' and \'I\' bands are arranged alternately throughout the length of the (b)____. The portion of the myofibril between two successive \'Z\' lines is considered as the functional unit of contraction and is called a (c)_____.
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