Mer Scott
Quiz by , created more than 1 year ago

Know the two main cations that contribute to the electrical properties of a neuron. Understand the different ways these cations can move across the semi-permeable membrane of the neuron (channels vs pump). List the different types of polarisation of a nerve cell membrane. Explain what is meant by the resting membrane potential. Explain what is meant by a local potential.

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Mer Scott
Created by Mer Scott about 7 years ago
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L21 Bioelectricity: Membrane Potentials in Neurons

Question 1 of 8

1

The phospholipid bilayer is an insulator which cations cannot pass through, but anions can.

Select one of the following:

  • True
  • False

Explanation

Question 2 of 8

1

Choose the incorrect statement about ions and the RMP.

Select one of the following:

  • At RMP, concentration of Na+ is low inside the cell.

  • Normal ECF concentration of Na+ is 135-145mmol/L

  • At RMP, K+ concentration is high outside of the cell.

  • Normal ECF concentration of K+ 3.5-5mmol/L

Explanation

Question 3 of 8

1

The Na+/K+-ATPase pumps 3 Na+ out of the cell against their gradient and 2 K+ ions into the cell against their gradient.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 8

1

Cells are at RMP the majority of the time.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 8

1

Choose the incorrect statement.

Select one of the following:

  • At RMP, most Na+ channels are closed

  • At RMP, some K+ channels are closed

  • Na+/K+-ATPase is inactive

Explanation

Question 6 of 8

1

At RMP if more Na+ channels open, the cell becomes depolarised meaning it becomes more negative (-) in comparison to the ECF

Select one of the following:

  • True
  • False

Explanation

Question 7 of 8

1

Choose the correct statements.

Select one or more of the following:

  • At RMP K+ outflow is slightly larger than Na+ inflow

  • Na+ channels opening causes depolarisation up to +30mV

  • K+ channels opening causes repolarisation

  • Hyperpolarisation is due to Na+ channels closing before K+ gradient is fully established

Explanation

Question 8 of 8

1

Depolarisation is inhibitory, hyperpolarisation is excitatory.

Select one of the following:

  • True
  • False

Explanation

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