Model 3: Action Potential Propagation Critical Thinking Questions 8. What portio
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Model 3: Action Potential Propagation Critical Thinking Questions 8. What portion of the neuron is being highlighted in this mode? 9. Draw an arrow on the small picture of the neuron to indicate the direction the action potential is traveling. Axon plasma membrane Neuronal cytoplasm (Na in) Repolarized Application Back to resting membrane potential Based on this model and the first model, write a consensus explanation for the mechanism by which an action potential travels from the cell body (soma) down the axon. 10.Explanation / Answer
8. Axon
9 .The action potential always travel from the body towards the axon , in this picture it would be from the left to the right side.
10. When the nerve cell is at rest , the membrane potential , called the resting membrane potential is negative because there are more sodium outside than inside.
When the dendrites of a nerve cell recieve a signal , or a stimulus , the end of the soma , called the axon hillock becomes depolarized. This is due to the opening of the voltage gated sodium channels on the membrane of axon.
This in turn causes inward movements of sodium , causing the inward of the cell to be more positive.
When one part of the axon becomes depolarized , it acts as the stimulus for the adjacent sodium channels down the line , which causes them to open. This way , now that next part gets depolarized .
As the next part is getting depolarized , the previous parts gets repolarized due to opening of potassium channels and closing of sodium channels , which will cause the Potassium ions to move out of the cell . This causes the inward of the axon to become negative .
The next part , which became depolarized , will now act as a stimulus for the next part and will get repolarized itself.
This is how the action potential travels across the neurons.
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