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What distinguishes a heart attack from heart failure.

A. A heart attack results from poor blood flow, while heart failure involves a total interruption of blood flow.

B. Both heart attack and heart failure result in heart tissue death, but more tissue dies as a result of heart failure.

C. Heart tissue dies during a heart attack, while heart failure results in systemic oxygen deficiency.

D. Heart failure results in body tissues receiving such a high level of oxygen that it is toxic.