Biology, asked by daniellydany01, 11 months ago

A group of scientists are investigating the properties of the action potential in the squid giant axon. Specifically, they decide to place the axon in an extracellular solution that has a 10% higher concentration of K+ than normal.

They then measure an action potential at one end of the axon and note that it has a different shape. How would you expect the shape of this action potential to change given the extracellular manipulation? (Select all that apply). There are two correct answers
1. The rising phase is faster.
2. The rising phase is slower.
3. The falling phase is faster.
4. The falling phase is slower.

Answers

Answered by Anonymous

Answer:

Hi buddy

Explanation:

2) is your answer

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Answered by emirshah01

Answer:

The rising phase is faster.

The falling phase is slower.

Explanation:

If the Nernst potential of K+ is more positive, then this means that the driving force of K+ will be lower when the voltage-gated K+ channels are opening during the peak of the action potential. With a lower driving force, less K+ current will flow over time and so the falling phase of the action potential is slower. Similarly, leak K+ current opposes the flow of Na+ into the cell during the rising phase. So, if the driving force of this K+ current is lower then the rising phase should be faster.

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