Why Does Depolarization of a Cardiac Muscle Cell Occur

question 12

Multiple Choice

Why does depolarization of a cardiac muscle cell occur?

• A) There is a decrease in the permeability of the cell membrane to ions.
• B) A rapid movement of ions across the cell membrane occurs.
• C) A blockade by calcium ions takes place.
• D) There is a stimuli instigated during the refractory period.

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