The flattening of the action potentials of myocardial contractile cells, called the plateau phase, is due to a combination of ________ K⁺ permeability and ________ Ca²⁺ permeability.

Question

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The plateau phase of myocardial contractile cells is characterized by decreased K⁺ permeability and increased Ca²⁺ permeability. This unique combination prolongs the action potential, helping to prevent tetanus in cardiac muscle by ensuring a sufficient refractory period.

The Flattening of the Action Potentials of Myocardial Contractile Cells