AAMC FL Q: Resistance

[mmcoffee]

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I know R = resistivity x Length / Area.

But what about Area? (pi*r^2) This is what made choosing between C) and D) difficult for me.

 

[Blueprint MCAT Tutor]

That's a great question. I think we have to assume that axons all have the same radius (as is given in the passage) but to calculate the resistance for any particular NCV pulse you need the length.

Another way to look at it would be to look at the units - in the table you're given ohm/m so multiply that by length to get ohms. Then you just need volts.

 

[mmcoffee]

Awesome, thanks for your help 🙂