Physioex 9.0

ashley2009

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13 years ago

I have a couple questions that i can not figure out that I need help with....

1. Explain why increasing extracellular K+ reduces the net diffusion of K+ out of the neuron throught the K+ leak channels?

2. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare with your prediction?

3. Explain why a change in extracellular Na+ did not significantly alter the membrane potential in the resting neuron?

4. Discuss the relative permeability of the membrane of Na+ and K+ in a resting neuron?

5. Discuss how a change in Na+ or K+ conductance would affect the resting membrane potential?

please help me if possible...this is due tomorrow for my class

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bio_man

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Educator

13 years ago

Hi again, what exercise do these questions belong to... Remember, only one question per new topic.

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ashley2009 Author

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13 years ago

ohhh exercise 3 activity 1...its called the resting membrane potential

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bio_man

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Educator

13 years ago

Quote from: ashley2009 (13 years ago)

ohhh exercise 3 activity 1...its called the resting membrane potential

Here's what I found:

Answers to Activity Questions:

1. The resting membrane potential is the same because the permeability of the ions is the same in both locations.

2. If the sodium-potassium pump is blocked, sodium will flow in, depolarizing the membrane.

3. The resting membrane potential would become more negative because there would be more negative anions inside the cell.

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ashley2009 Author

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13 years ago

do these numbers correspond with my numbers? sorry im so confused Frowning Face

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bio_man

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Educator

13 years ago

Quote from: ashley2009 (13 years ago)

do these numbers correspond with my numbers? sorry im so confused Frowning Face

Probably not Smiling Face with Open Mouth

But they were obtained from activity one, though.

Activity 1: The Resting Membrane Potential (pp. PEx-36–PEx-39)

Predict Question 1: If the extracellular K+ concentration is increased, the resting membrane will become less negative.

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ashley2009 Author

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13 years ago

ohh

i have no idea Frowning Face

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ashley2009 Author

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13 years ago

if i give you the question i need answered you can do it? or not? like one at a time?

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bio_man

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Educator

13 years ago

Quote from: ashley2009 (13 years ago)

Explain why increasing extracellular

Oh, I see what's going on! These are review questions... Yes, yes. That would be better.

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ashley2009 Author

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13 years ago

yeahh lol. i got them though...i may need help in a little while with some more though so dont go anywhere haha.

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bio_man

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#10

Educator

13 years ago

Quote from: ashley2009 (13 years ago)

yeahh lol. i got them though...i may need help in a little while with some more though so dont go anywhere haha.

I'll be around Wink Face

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ashley2009 Author

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#11

13 years ago

okay good!!! Slight Smile

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ashley2009 Author

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#12

13 years ago

okay here is a review question...

sensory neurons have a resting potential based on the efflux of potassium ions (as demonstrated in Activity 1). What passive channels are likely found in the membrane of the olfactory receptor, in the membrane of the Pacinian corpuscle, and in the membrane of the free nerve ending?

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bio_man

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#13

Educator

13 years ago

Quote from: ashley2009 (13 years ago)

The efflux of potassium ions is maintained by passive potassium channels.

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