Chapter 5 Action Potentials

Question 1

What is Nernst equation/ when there is no net flux

Answer 1

E= 61 X log (Kout/Kin) mV

Or

E= (1/Zx) X 61 X log (Xo/Xin)

Question 2

Channels can be ___, ___, or ___ gated

Answer 2

Voltage, Ligand, chemically

Question 3

Potassium wants to ___, sodium wants to go ___. Nernst potential shows what

Answer 3

Leave, go in

How badly sodium wants to come in or how badly K wants to leave

Question 4

What is Goldman Hodgkin Katz equation

Answer 4

-61 X log
(CNai + PNa + (other ions present)/ CNaO + PNa)

P= permeability
C= concentration

Question 5

Use ___ and ___ to repolarize cell faster

Answer 5

Potassium and chloride

Question 6

Need to run sodium and potassium pump when. Why

Answer 6

When eating. Need glucose to give ATP for pumps

Question 7

Potassium channels open ___ than sodium channels

Answer 7

Slower

Question 8

Potassium has a lot more ____ at rest sodium

Answer 8

Conductance/permeability

Question 9

Relative refractory period

Answer 9

Action potential can be generated by a stronger stimulus, below resting membrane potential

Question 10

Absolute refractory period

Answer 10

No action potential can be generated, not below threshold

Question 11

____ or ___ channel opening will hyperpolarize cell

Answer 11

Chloride or potassium

Question 12

Depolarize a post synaptic cell by opening a ___ channel

Answer 12

Sodium