Crossword Puzzle musclesOnline version crossword of cardiac muscles by Dante Sipp 1 found in the walls of the heart 2 large muscle of the outer surface of the illum 3 muscle found in the walls of internal organs 4 ability of a muscle to shorten in response to an action potential 5 the ability to stretch 6 large muscle located at the back of the arm 7 ability of a muscle to recover to its original shape after contraction or extension 8 thick powerful muscle, that covers the shoulder joint and upper humerus 8 2 5 6 1
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