- Describe the role of sodium ions and sodium channels in generating an action potential. - What would happen to a neuron if it was exposed to tetrodotoxin? Be specific regarding its effect on the ability of a neuron to communicate.
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Role of sodium ions and sodium channels in generating an action potential: When a neuron is at rest, there is a higher concentration of sodium ions outside the cell and a higher concentration of potassium ions inside the cell. The cell membrane is selectively Show more…
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What is sodium's role in an action potential? It flows out of the neuron causing the cell to depolarize. It gets pumped into the neuron allowing the cell to regain resting potential after the action potential is finished. It flows into the neuron causing the cell to depolarize. It gets pumped out of the neuron causing the cell to repolarize.
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Describe the roles of sodium, potassium, and calcium ions in the generation, conductance, and/or transmission of action potentials within a pre-synaptic neuron; note that all three ions might not be involved in each of these processes in a pre-synaptic neuron.
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Starting with a neuron at resting membrane potential, explain the movement of sodium ions during an action potential in terms of the 5 principles in the "Flow Down Gradients" core concept. Be sure to address each principle with respect to sodium ions throughout the action potential.
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