With respect to the generation and transmission of an action...

With respect to the generation and transmission of an action potential from hillock to terminal button, explain each of the following and their respective roles in the process: Neural integration, voltage-dependent sodium channels, cable properties, myelin sheaths, and nodes of Ranvier.

Transcript

00:01 In this question we will see that the propagation that the propagation of action potential of action potential which is along the nerve axon it involves a rapid depolarization a rapid depolarization and repolarization of the neurons membrane potential.

00:29 So this process it is initiated by a stimulus that causes the opening of the voltage gated ion channels voltage gated ion channels and it allows the positively charged ions to enter in the cell and depolarize the membrane potential.

00:54 So now the initial depolarization the initial depolarization event which is known as the threshold potential it triggers it triggers a positive feedback loop positive feedback loop that leads to rapid depolarization of the membrane potential.

01:21 So this depolarization is it causes the opening of voltage gated sodium channels it opens the voltage gated sodium channels which allows the sodium ions to flow into the cell.

01:39 Now further depolarizing the membrane potential this process it continues it continues until a membrane potential it reaches its peak it reaches its peak at which point the sodium channel begins to close this channel it becomes to close.

01:58 So now as the membrane potential they become to repolarize repolarize the voltage gated potassium ion potassium ion it opens and it allows the potassium ion to flow out of the cell sodium ions are flowing inside and potassium it will flow out of the cell and restore the negative charge on the inside of the membrane.

02:26 So this repolarization process it also causes the sodium channels to become inactivated it made them inactivated and it prevents the flowing of sodium ion inside of the cell...

Question

With respect to the generation and transmission of an action potential from hillock to terminal button, explain each of the following and their respective roles in the process: Neural integration, voltage-dependent sodium channels, cable properties, myelin sheaths, and nodes of Ranvier.

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