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On Administration of an Agent,heart Rate Increases Because of a Direct

Question 8

Multiple Choice

On administration of an agent,heart rate increases because of a direct effect on the heart.However,total peripheral resistance decreases dramatically.As a consequence,systolic blood pressure increases only slightly,and mean arterial pressure typically falls.This agent is


A) epinephrine.
B) norepinephrine.
C) phenylephrine.
D) isoproterenol.

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