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Action Potential and Ion Regulation

Describe the events that must occur to generate an action potential. Indicate how the ionic gates are controlled, explain why the action potential is an all-or-none phenomenon.

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Describe the events that must occur to generate an action potential. Indicate how the ionic gates are controlled, explain why the action potential is an all-or-none phenomenon.

Defining terms:
Depoliarization- reduced potential
Hyperpolarization- increased potential
Repolarization- return to the potential
Na- Sodium
K- Potassium
ATPase- protein complex that uses ATP to function
Channel- protein that allows ions to flow in or out of a cell. Ions flow based upon ion concentration gradient (from high to low concentration). This does not use energy or ATP.

First, let us talk about why an action potential is all or none and then we will discuss the details.

A stimulus signals to a neuron in electrical form. This electrical conductance results from changes in ion gradients. A neuron's resting potential is usually around -70 millivolts.
1) Stimulus inputs lead to depolarization of the neuron. However, a neuron does not commit to depolarization ...

Solution Summary

This response examines the concept of an all or none action potential. Regulation of ions during resting potential, action potential and restoration of membrane potential is discussed.

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