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In the heart,1) action potentials are conducted from cell to cell across the myocardium via gap junctions2) the SA node sets the pace for the heart as a whole,3) spontaneous depolarization of cardiac cells can occur in the absence of nerve stimulation4) cardiac muscle can continue to contract for long periods in the absence of oxygena. all of the aboveb. 1,3,4c. 1,2,3d. 2,3

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