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IBDP Biology- Resting and Action Potential (1/2)

Topic 3- Impulse along neuron

· IBDP BIOLOGY,nerve

In part one of the IBDP BIology Blog post, we will learn the resting and action potential of the nerve impulses, and how the impulse is passed along a neuron, let's get started!

How a nerve impulse passes along a non-myelinated neuron

Below: ion pump in a plasma membrane. 

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Resting Potential

At rest there is a potential difference between the outside of the membrane of an axon and the inside. The usual value used is - 70mV. 

Outside is positively charged. 

Inside is negatively charged. 

Concentration of Na+(Sodium) is higher on the outside. 

Concentration of K+(Potassium) is higher on the inside. 

Both are positive so there is no potential difference. The distribution of Cl- makes the resting potential. This is maintained by the properties of the selectively permeable membrane. 

Action potential

Information travels down a neuron as an action potential. 

AP is generated by a stimulus of a receptor or from an AP from another connecting neuron. 

Although the potential difference is back to original values, the sodium and potassium ions are in the wrong place. 

The sodium/potassium pump will return them to original positions via active transport. 

Action potentional is the time of depolarization (1msec). 

That is all for Part one!

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References:

  • https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FSketch-of-the-structure-of-the-cell-membrane-showing-the-ion-gradient-ion-channel-and_fig4_318361386&psig=AOvVaw3FOE-68Jo3qhHVjpwU7QUr&ust=1627052260444000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCJC1oqX49vECFQAAAAAdAAAAABAD

Drafted by Venetia (Biology)

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