The Cells of the SA Node Are Unable to Maintain

question 52

Multiple Choice

The cells of the SA node are unable to maintain a stable resting membrane potential.They are particularly leaky to ions like sodium and potassium.What will this leakiness lead to?

• A)the release of neurotransmitters, which will start a contraction
• B)the formation of the resting membrane potential
• C)the secretion of calcium from storage within the cell to the exterior of the cell
• D)the spontaneous formation of an action potential

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