Which of the Following Statements Concerning Action Potentials in the Heart

question 204

Multiple Choice

Which of the following statements concerning action potentials in the heart is correct?

• A) The rising phase of the action potential in cardiac autorhythmic cells is due to a rapid Ca²⁺ influx.
• B) The rising phase of the action potential in cardiac contractile cells is due to a rapid Na⁺ influx.
• C) The plateau phase of the action potential in cardiac contractile cells is due to a slow Ca²⁺ influx.
• D) Two of these answers are correct.
• E) All of these answers are correct.

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