Alice Storr
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- Psychology Quiz on transmitting an impulse - resting potential, created by Alice Storr on 20/04/2017.

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Alice Storr
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transmitting an impulse - resting potential

Question 1 of 9

3

Concentration gradients across the membranes of the exon are established by which pump Na+ out and 2 in

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    sodium-potassium pumps
    gated channels
    3
    2
    K+
    Cl-

Explanation

Question 2 of 9

1

A negative charge inside the axon is also caused by the following negative molecules:

Select one or more of the following:

  • anions - glucose, amino acids, proteins

  • chloride ions

  • onions

  • hydrogen atoms

Explanation

Question 3 of 9

1

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This continues until there is ( no, a large, a small ) difference in charge across the ( axon membranes, nodes of ranviar )

Explanation

Question 4 of 9

1

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( Potassium, Sodium ) ions diffuse out of the neurone down the ( potassium, electrochemical, sodium ) concentration gradient

Explanation

Question 5 of 9

1

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This makes the inside of the axon more ( negative, positive ) and the outside more ( positive, negative )

Explanation

Question 6 of 9

1

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Some ( sodium, potassium ) moves into the axon down the ( sodium, potassium ) concentration gradient but the membrane is not very permeable to ( sodium, potassium ), unlike ( potassium, sodium ), so this amount is ( small, large )

Explanation

Question 7 of 9

1

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The diffusion of ( sodium, potassium ) makes ( no, all the ) difference to the charge across the membrane. The diffusion of ( potassium, sodium ) out of the axon is the cause of a potential difference of ( -70, +40 )mV across the membrane. This charge is ( stable, unstable ) because the ( electrochemical, potassium concentration ) gradient goes from the outside to the inside of the axon whereas the ( potassium concentration, electrochemical ) gradient goes from the inside of the axon to the outside. Sodium cannot interfere due to the ( impermeability, permeability, dark forces of nature ).

Explanation

Question 8 of 9

1

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You can now describe the axon as p

Explanation

Question 9 of 9

1

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To summarise: a resting potential has a potential difference across the membrane of mV. This is caused by the movement of sodium and potassium. First, sodium is moved whilst potassium is moved . Next, moves out too. After that, moves back in. At this stage, the e gradient and potassium concentration gradient balance each other. The axon is .

Explanation

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