After a heart attack, fibrosis occurs at the site of cardiac muscle cell death. This reduces the efficiency of the heart's pumping activity because __________.>the undamaged cardiac muscle cells become fatigued from the energy expended during the healing process>fibrous connective tissue is incapable of contracting>fibrosis produces new cardiac muscle cells that are not as strong as the mature ones that died>the initial death of some cardiac muscle cells triggers a chain reaction in which progressively more and more neighboring healthy cells die

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