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Auckland OLY1 chat - archive

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Can't believe they put in Ethnicity Data.... Totally messed up question 2... I wonder if question 3 marking is totally separate from question 2? D:
 
Worshipppp said:
Can't believe they put in Ethnicity Data.... Totally messed up question 2... I wonder if question 3 marking is totally separate from question 2? D:
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Yeah same i imagine you would get some marks for question 2&3 even if it was not bang on perfect though. Ahhh it seemed like such an easy exam but i screwed up on a few little things here and there :( ahh well will have to use it as motivation to study better for 107 and chem.
 
Yeah, the surveillance question caught me by surprise (not sure if it's ever been in a past paper) and the ethnicity table really stuffed me up. But otherwise, many of the questions were repeats from past papers so, it was a fair paper.

TIME TO CRAM 107 AND 110 :bored:
 
Nogeat said:
Yeah, the surveillance question caught me by surprise (not sure if it's ever been in a past paper) and the ethnicity table really stuffed me up. But otherwise, many of the questions were repeats from past papers so, it was a fair paper.

TIME TO CRAM 107 AND 110 :bored:
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Yeah same, for me it was the case design thing and then that thing from the workshop which looked just soo easy but i never went over it :cry:
 
Hey all, just wondering about the answer to one of the 2010 MCQs for 107: why is the equlibrium potential for Na+ represented by "the influx of Na+ along its concentration gradient balanced by the efflux of Na+ along its electrical gradient"?

My understanding is that since the extracellular Na+ concentration is higher than that of the intracellular Na+ concentration, there is an influx of Na+ along its concentration gradient via passive diffusion. However, the cytosol of cells is more negative than the extracellular fluid, so why is there an efflux of Na+ along its electrical gradient (as Na+ should be driven into the cell, right?)?

Please correct any misunderstandings I might have! Thanks :)
 
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Hopefully said:
Hey all, just wondering about the answer to one of the 2010 MCQs for 107: why is the equlibrium potential for Na+ represented by "the influx of Na+ along its concentration gradient balanced by the efflux of Na+ along its electrical gradient"?

My understanding is that since the extracellular Na+ concentration is higher than that of the intracellular Na+ concentration, there is an influx of Na+ along its concentration gradient via passive diffusion. However, the cytosol of cells is more negative than the extracellular fluid, so why is there an efflux of Na+ along its electrical gradient (as Na+ should be driven into the cell, right?)?

Please correct any misunderstandings I might have! Thanks :)
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Yeah, your theory of an influx of sodium ions would be true if the resting membrane potential of the cell is at the typical -60ish mv. But the question asks about the equilibrium potential for Na+ which I think is +60mv (i can't remember the exact value but it's a positive value). That is, the cell would be more positive than the extracellular fluid, so Na+ will move out from the cell or known as efflux of Na+ down its electrical gradient. Hope that clears things up ^_^
 
Nogeat said:
Yeah, your theory of an influx of sodium ions would be true if the resting membrane potential of the cell is at the typical -60ish mv. But the question asks about the equilibrium potential for Na+ which I think is +60mv (i can't remember the exact value but it's a positive value). That is, the cell would be more positive than the extracellular fluid, so Na+ will move out from the cell or known as efflux of Na+ down its electrical gradient. Hope that clears things up ^_^
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Yeah, thank you so much, [MENTION=13210]Nogeat[/MENTION]! It definitely cleared up my confusion!

GOOD LUCK for the exam! :D
 
Thank you, [MENTION=11486]marsupial[/MENTION]! :D

[OFFTOPIC]WHOO, CONGRATS ON YOUR #50 POST! (yy) Scroll down and marvel... XD[/OFFTOPIC]
 
I'm gonna throw in a good luck here too. First semester was a killer for me - whatever you do, don't burn out! You're almost there!
 
Haha, thank you, [MENTION=13362]chameleon[/MENTION]! :D

So looking forward to the end of this week = NO MORE EXAMS for a while! :p

[OFFTOPIC]I couldn't help but notice that you're doing medicine down at Otago. Am I right? ;)
First semester was a killer for me
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Anyways, what I wanted to ask is: you did OLY1??? (Or is it "first semester" referring to HSFY? (Just curious, haha.)[/OFFTOPIC]
 
You're welcome, [MENTION=13946]Hopefully[/MENTION] ;)

Yes! I am really looking forward to going home this holidays. It sounds pathetic but I really miss my cats! That and a warm house with free food and no power bills to worry about, heh heh...

[offtopic]Yeah, I'm doing medicine at Otago, you are correct. Also correct that I was referring to HSFY, sorry... my head is not screwed on properly tonight! For some reason I just assumed they were equivalent, but a friend of mine at AU says OLY1 is harder. I hope that's not the case, for your sake![/offtopic]
 
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