In our tank, now let's imagine a situation with

80mMK+

and

10mMNa+

inside, and

10mMK+

and

125mMNa+

outside. Assume that there are completely impermeable anions present on both sides of the membrane to balance out the positive charges of

K+

and

Na^(+)

. We'll run the experiment at room temperature

(20\\\\deg C)

.\ a. In this scenario, calculate the resting membrane potential if only

Na+

is able to cross the membrane.\ b. Now calculate the resting membrane potential if

K^(+)

and

Na^(+)

could both cross the membrane equally easily

(P_(K)

)

=

(

P_(Na))

.\ c. Now calculate the resting membrane potential if the membrane is

25

times more permeable to

K^(+)

than

Na^(+)

. Try to put into words why the Vm shifted in (b) and (c) as compared with the situation in part (a).\ \ Please nswer all parts and show work

3. In our tank, now let's imagine a situation with 80mMK+ and 10mMNa+ inside, and 10mMK+ and 125mMNa+ outside. Assume that there are completely impermeable anions present on both sides of the membrane to balance out the positive charges of K+ and Na+. We'll run the experiment at room temperature (20C). a. In this scenario, calculate the resting membrane potential if only Na+ is able to cross the membrane. b. Now calculate the resting membrane potential if K+and Na+could both cross the membrane equally easily (PK=PNa). c. Now calculate the resting membrane potential if the membrane is 25 times more permeable to K+than Na+. Try to put into words why the Vm shifted in (b) and (c) as compared with the situation in part (a)