AP questiion

[redmoon07]

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part of reserch by medical student , cardiac cell has Ap of + 60 mv first time and + 30mv second time .......... why it's decrease in second time ......
a. student add more Na+ outside cell....
b. student remove the Na+ from outside cell.....
c. student add more K+ inside cell
d. student remove K+from inside cell

 

[Cliff Huxtable]

part of reserch by medical student , cardiac cell has Ap of + 60 mv first time and + 30mv second time .......... why it's decrease in second time ......
a. student add more Na+ outside cell....
b. student remove the Na+ from outside cell.....
c. student add more K+ inside cell
d. student remove K+from inside cell

Is the answer B?

I am thinking the AP peaked lower because there was less influx of Na.

K channels don't open until after the peak.

?

 

[usmletoo]

D?
tell us!!!!

 

[perilou]

Is the answer B?

I am thinking the AP peaked lower because there was less influx of Na.

K channels don't open until after the peak.

?

👍 my guess

During the upstroke, it's going to the Nernst potential for sodium, which is normally +60. If there is a lower concentration of Na outside the cell, I would think it would lower the Nernst potential of Sodium. And, ass Cliff said, K+ channels don't open until after the peak.

 

[SnowTown]

E. Student was intoxicated and dropped the voltmeter between the two measurements

 

[redmoon07]

E. Student was intoxicated and dropped the voltmeter between the two measurements

😱
😀

 

[redmoon07]

sorry i have no answer 😕 as i just copied and pasted here from other forum.
but i also agree with B.

 

[rahulb]

the answer is B
this is from the uw self assessment #2

 

[Cliff Huxtable]

👍 my guess

During the upstroke, it's going to the Nernst potential for sodium, which is normally +60. If there is a lower concentration of Na outside the cell, I would think it would lower the Nernst potential of Sodium. And, ass Cliff said, K+ channels don't open until after the peak.

WHA ?!?!?!??!?!?!




lol j/k

 

[redmoon07]

the answer is B
this is from the uw self assessment #2

It is big relief,could you please post explanation for this with if possible complete question?
will appreciate it.
thank you.

 

[rahulb]

 

[SnakeEyes]

Surprised they let you take a capture of that. UW has the lockdown on my mac.

What OS is that? linux?

 

[perilou]

WHA ?!?!?!??!?!?!




lol j/k

LOL!

Unfortunate typo

 

[perilou]

UW pic

Nice job. 👍

 

[rahulb]

Surprised they let you take a capture of that. UW has the lockdown on my mac.

What OS is that? linux?

yea its ubuntu.

i'm using it exclusively to prep for the step because i can 1) screenshot uw diagrams to peruse without logging in and 2) stay away from the world of warcraft dir on my vista partition 😉

 

[neil100]

Now it makes sense. The way you posted the question at first was very unclear. Yes the answer is most definitely A. No doubt.