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The rate of heart beat is decreased by

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adrenal medullary hormones

parasympathetic signals

sympathetic signals

thyroxine hormone

answer is B.

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Detailed Solution

Parasympathetic neural signals decrease the rate of heart beat, speed of conduction of action
potential and thereby the cardiac output.

Sympathetic nerve signals increase the rate of heart beat, the strength of ventricular contraction and thereby the cardiac output.

Adrenal medullary hormones and thyroxine increase the cardiac output.

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