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Flashcards in electric potential Deck (18):
1

normal in/out [C] of Na and K

K: 140in and 4 out
Na: 14in and 142out

2

what does Na/K pump do

2 K in for 3 Na out at cost of 1 ATP

3

normal inner cell e

-70mV

4

define equilibrium potential

E(x) = the amount of electrical potential that counters diffusion

5

what is equilibrium potential for Na and K

Na: +61
K: -94

6

why does resting potential end up at -70

membrane more permeable to K

7

key to determining resting potential

resting potential will be closer to ion with most permiability

8

what is structure of protein channel

protein in membrane with a water channel running through it

9

what are 2 main states of protein channel

1. conducting
2. non-conducing

10

what is transition period between called

gating

11

what are 3 things that can gate a channel

1. action potential
2. ligand - receptor binding
3. stretch or stress

12

what is K permeability of membrane at rest

very permeable

13

4 key features of action potentials

1. all-or-nothing
2. constant amplitude
3. initiated by depolarization
4. constant velocity

14

4 stages of action potential

1. upstroke
2. downstroke
3. hyperpolarization
4. resting

15

what happens to ion channels in upstroke

Na opens

16

what happens to ion channel in downstroke

Na closes, K opens

17

what happens to ion channel in hyperpolarization

K open means almost hit E(K)

18

3 stages of potential transmission

1. rest
2. initiation
3. propagation

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