Question 1 Which of the following are true of the equilibrium potential of an io

Question

Question 1

Which of the following are true of the equilibrium potential of an ion?(choose all that apply)

It is the electrical charge needed to balance the concentration of all ions on either side of the membrane.

It is the point at which there is no net movement of the ion in question.

It is the point at which there is no movement of the ion in question.

It is the point at which the electrical potential is offset by an equal and opposite chemical potential.

I have no idea which one it is for this question.

Question 2

The equilibrium potential of an ion:(choose all that apply)

Can be calculated using the Nernst equation.

Depends on the concentration of the ion on either side of the membrane.

Depends on the 'charge' of the ion.

Must be determined experimentally.

Depends on the membrane potential of the cell.

What I thought: I thought equlibrium potential = membrane potential
it looks like all 5 are true, but im not sure

Question 3

The difference between Nernst and Goldman equations is that:(choose all that apply)

a) Goldman can calculate anions (negative charges), while Nernst cannot.

b) Goldman takes permeability of each ion into consider, while Nernst does not.

c) Goldman takes multiple ion species into account, while Nernst only takes one ion into account.

d) They are the same when the membrane is permeable to only one ion.

What I thought: I thought B),C) and D) were true

Question 4

According to Ohm's Law, The potential difference that exists across a membrane is directly proportional to the membrane resistance.

a)True

b)False

What I thought: I thought it was false

Question 5

If the membrane potential at the axon hillock becomes subthreshold, an action potential will be fired.

a)True

b)False

What I thought: I thought it was also false

Question 6

During the rising phase of an action potential, incoming Na+:(choose all that apply)

a)I nactivates Na+ channels.

b) Hyperpolarizes the cell

c) Depolarizes the cell.

d) contributes to opening of voltage-gated K+ channels.

What I thought: C) and D)

Question 7

During the falling phase of an action potential, Na+ channels:(choose all that apply)

a) are closed

b) are inactivated

c) permit Na+ ions into the neuron.

d) do not permit Na+ ions into the neuron.

What I thought: I thought NA channels closed but I remember reading somewhere they inactivate, so I thought it was A) and D) but now Im thinking B) and D) but im not sure

Question 8

The refractory period goes from "absolute" to "relative" when:(Choose all that apply)

The inactivation gate of Na+ channels opens up.

The inactivation gate of Na+ channels closes.

K+ channels begin to open.

d) K+ channels begin to close.

What I thought: I thought either B) and D) or just B). Again not sure

I wrote down my thoughts for each question and which ones I thought were correct and which ones I thought were incorrect. Please give me your answers for each question, if you think they are the same as mine or if you have completely different ones and why. Ill give points for the first person who obviously looks correct and gives effort into it right away!

It is the electrical charge needed to balance the concentration of all ions on either side of the membrane.

It is the point at which there is no net movement of the ion in question.

It is the point at which there is no movement of the ion in question.

It is the point at which the electrical potential is offset by an equal and opposite chemical potential.

Explanation / Answer

1- Equilibrium potential of ion - Every ion have its own electrode potential. When these ion have same potential to the membrane potential it is called equilibrium potential. At this no movement of ion occurs. So b and c are correct answer. A is a definition of membrane potential.

2- Equilibrium potential can be calculated by the Nernst equation and Depends on the concentration of the ion on either side of the membrane, Depends on the 'charge' of the ion, Depends on the membrane potential of the cell. so correct answer a, b, c and e.

3- c) Goldman takes multiple ion species into account, while Nernst only takes one ion into account.

d) They are the same when the membrane is permeable to only one ion.

4- It is true because V = iR

                           5. False

                           6. The correct answer is option (C)

                           During the rising phase of an action potential, Na+ enters the cell and depolarises the cell.

                          7. The correct answer is option (A)

                            The Na+ channels are closed during the falling phase of an action potential.

                         8. The correct answer is option (B)

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