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2 years ago
Potassium ions are important in the resting membrane potential and the action potential of both nerve and muscle cells. The concentration gradient of potassium ions is critical to both. An excess of potassium outside a neuron or muscle cell would negate the concentration gradient. What would happen if the heart were injected with massive amounts of potassium? Explain your answer.
Textbook 
Biology of Humans: Concepts, Applications, and Issues
Edition: 5th
Authors:
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2 years ago
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Potassium ions added to the exterior of a cell would disrupt the resting membrane potential, because they would not "leak" in the correct direction. During the resting potential, there are more potassium ions inside of the cell; during the action potential, potassium leaks out of the cell. An action potential could be initiated as sodium rushes into the cell, but another one could not be generated.
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wrote...
2 years ago
This is consistent with the textbook, thx
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