What Would Happen in Muscle Cells Dissociated from the Atrium

question 14

Multiple Choice

What would happen in muscle cells dissociated from the atrium of the heart if you added acetylcholine in the presence of an inhibitor of RGS proteins?

• A) There would be a decrease in potassium channel activity.
• B) There would be an increase in potassium channel activity that lasted shorter than normal.
• C) There would be an increase in potassium channel activity that lasted longer than normal.
• D) There would be no change in potassium channel activity.
• E) There would be an increase in calcium channel activity that lasted longer than normal.

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