Q.

With regard to the effect of thyroid hormone on the cardiovascular system, which of the following are TRUE?

A. level of noradrenaline are increased
B. β adrenergic receptor affinity is decreased in heart muscle
C. circulating adrenaline levels are decreased
D. thyroid hormone levels alter the ratio of cardiac myosin isoform types
E. none of the above
Answer» D. thyroid hormone levels alter the ratio of cardiac myosin isoform types
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