During the S-T Segment, What Is Occurring Within Cardiac Muscle

question 129

Multiple Choice

During the S-T segment, what is occurring within cardiac muscle cells?

• A) Sodium is rapidly diffusing out of atrial muscle cells.
• B) Sodium channels are beginning to open in ventricular cells and calcium is entering through slow channels in atrial cells.
• C) Calcium is entering and potassium is leaving ventricular cells.
• D) Potassium is entering atrial cells and sodium is leaving ventricular cells.

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