Which of these statements describes action potentials in the heart
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 K⁺ influx.
C)The plateau phase of the action potential in cardiac contractile cells is due to a rapid Ca²⁺ influx.
D)The plateau phase of the action potential in cardiac contractile cells is due to a rapid K⁺ influx.

Question

Quizplus · Accepted Answer

In cardiac autorhythmic cells, the rising phase of the action potential is primarily due to a rapid influx of Ca²⁺ ions.

Which of These Statements Describes Action Potentials in the Heart