Answer
The correct answer is C. During a heart attack, heart tissue dies from a blockage in blood flow, whereas heart failure leads to a systemic lack of oxygen. A heart attack, or myocardial infarction, happens when blood flow to the heart becomes blocked for an extended time, resulting in tissue death due to insufficient oxygen. This blockage is often caused by a blood clot in a coronary artery narrowed by cholesterol-rich plaque. Conversely, heart failure is a chronic condition where the heart struggles to pump blood adequately to satisfy the body’s demands. It can result from various factors, such as prior heart attacks, high blood pressure, or cardiomyopathy. In heart failure, the heart’s reduced pumping ability leads to inadequate oxygen-rich blood for the body, resulting in symptoms like fatigue and shortness of breath. Importantly, heart failure does not typically involve dead heart tissue but is marked by the heart’s inability to pump effectively, causing widespread oxygen deficiency and fluid retention. The other options are incorrect: Option A misunderstands heart failure as not involving total blood flow interruption but rather inefficiency in pumping. Option B falsely assumes more tissue death in heart failure, which is not accurate; it depicts two distinct conditions. Option D incorrectly claims excessive oxygen toxicity from heart failure, while the issue lies in inadequate oxygen distribution to the tissues.
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