In Order for the Heart to Contract, an Action Potential

question 70

Multiple Choice

In order for the heart to contract, an action potential must be generated at the sinoatrial node. If this signal fails to reach the Purkinje fibers, what will be the result?

• A)The systolic period will be elongated
• B)The diastolic period will be shortened
• C)The Purkinje fibers will act as pacemaker cells but fire at a slower rate
• D)The ventricles will not contract and blood will pool within the heart

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