(Solved) please help with question about change in membrane potential and ion movemen

runner2392

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12 years ago Edited: 12 years ago, runner2392

please help with question about change in membrane potential and ion movemen

The image in the link hows an action potential (change in membrane potential) recorded from Dionaea (Venus Flytrap), a carnivorous plant that catches and eats insects. The depolarizing phase of this action potential, marked with an ‘A’, could be produced by the cell becoming more permeable to which ion(s)? Choose any that apply.
a) sodium, Na+
b) potassium, K+
c) calcium, Ca2+

I was thinking Na+ and K+. Na+ is in high concentration outside a typical cell and K+ is in high concentration inside a typical cell. Na+ can move down its concentration gradient through a channel and K+ can be pumped in.

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bio_man

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runner2392 Author

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12 years ago

yeah, that was my initial guess. since it's talking about an ion channel, and channels facilitate diffusion. K+ can't be pumped with an ion channel. thanks! Slight Smile

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bio_man

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12 years ago Edited: 12 years ago, bio_man

Quote from: runner2392 (12 years ago)

yeah, that was my initial guess. since it's talking about an ion channel, and channels facilitate diffusion. K+ can't be pumped with an ion channel. thanks! Slight Smile

Which one are you choosing?

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runner2392 Author

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12 years ago

i'll be going with Na+ and Ca2+. since they are usually more concentrated outside the cell. an objections?

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runner2392 Author

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12 years ago

also, can you help me with this question? it's stumbling me the most.

https://biology-forums.com/index.php?topic=15969.0

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how_mendel

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12 years ago

Quote from: runner2392 (12 years ago)

i'll be going with Na+ and Ca2+. since they are usually more concentrated outside the cell. an objections?

I don't see why you'd choose Ca++ Undecided

When is that ever part of an action potential?

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Biology!

runner2392 Author

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12 years ago Edited: 12 years ago, runner2392

what about in muscles? i guess plants wouldn't have muscles...

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robertling

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12 years ago

Quote from: runner2392 (12 years ago)

what about in muscles? i guess plants wouldn't have muscles...

Even in muscles, Ca++ isn't involved in action potentials.

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runner2392 Author

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12 years ago

alright, thanks for the input! final answer will be Na+ only.

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