If a Nerve to an Isolated Heart Is Stimulated and the Heartbeat

question 5

Multiple Choice

If a nerve to an isolated heart is stimulated and the heartbeat slows,the most reasonable conclusion is that the heart

• A) is responding to a nerve control that inhibits heartbeat.
• B) is dying since nerves can only stimulate muscle action.
• C) is unaffected by the nerve but responding to some unknown chemical factor.
• D) is normal as all nerve stimulation results in decreased muscle activity.
• E) None of the choices are correct.

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