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In the presence of a drug that blocks all effects of norepinephrine and epinephrine on the hea, the autonomic nervous system can

A

Raise the hea rate above its intrinsic rate

B

Lower the hea rate below its intrinsic rate

C

Raise and lower the hea rate above and below its intrinsic rate

D

Neither Praise nor lower the hea rate from its intrinsic rate

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