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Explain the exceptional endurance of the heart's continuous beating throughout a lifetime:
Its contractions exhibit variable rates
It experiences minimal metabolic demands during rest
It utilizes alternative energy substrates such as lactic acid
Neither of the aforementioned options is accurate
Answers (1)
The exceptional endurance of the heart's continuous beating throughout a lifetime can be attributed to the fact that it experiences minimal metabolic demands during rest. During periods of rest, when the body's overall metabolic needs are lower, the heart's workload decreases. This allows the cardiac muscle to conserve energy and recover, replenishing its energy stores. However, it's important to note that the heart does not completely stop beating during rest. It continues to beat at a lower intensity to maintain essential functions such as circulation and organ perfusion. This ability to operate at a reduced intensity during rest contributes to the heart's long-lasting endurance.
Hence, the correct answer is option 2.
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