The two ions that are responsible for the initial depolarization of cardiac muscle as they travel from the outside of a muscle cell to the inside of the cell are

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The two ions responsible for the initial depolarization of cardiac muscle as they travel from the outside of a muscle cell to the inside of the cell are sodium and calcium ions. Sodium ions rush into the cell during the depolarization phase of the action potential, while calcium ions enter the cell during the plateau phase to prolong the depolarization and allow for proper contraction of the cardiac muscle fibers.

The Two Ions That Are Responsible for the Initial Depolarization