Chronic release of excess thyroxine can cause a sustained increase in heart rate and a weakened heart.

Name: Chronic release of excess thyroxine can cause a sustained increase in heart rate and a weakened heart.
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Excess thyroxine, a hormone produced by the thyroid gland, can lead to hyperthyroidism, which increases metabolism and heart rate, potentially weakening the heart over time.

Chronic Release of Excess Thyroxine Can Cause a Sustained Increase