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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