Action Potentials in Neurons

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Questions and Answers

What is the term used to describe a neuron with a negative membrane potential?

  • Equilibrated
  • Polarised (correct)
  • Depolarised
  • Hyperpolarised

Which ion occupies a higher proportion in the inner membrane of a neuron?

  • Calcium
  • Chloride
  • Potassium (correct)
  • Sodium

What type of ion channels open due to the physical stretching or deformation of the membrane?

  • Potassium-Gated Channels
  • Mechanically-Gated Channels (correct)
  • Ligand-Gated Channels
  • Voltage-Gated Channels

What does the sodium-potassium pump do to establish an electrochemical gradient across the cell membrane?

<p>Pumps 3 potassium ions out for every 2 sodium ions pumped in (B)</p> Signup and view all the answers

What is a 'graded' potential that is not sufficient to propagate along the axon?

<p>Small change in membrane potential (B)</p> Signup and view all the answers

What does the resting membrane potential of a neuron typically measure at?

<p>-70mV (C)</p> Signup and view all the answers

In what state is a neuron when it possesses a negative membrane potential?

<p>Polarised (C)</p> Signup and view all the answers

At what membrane potential do voltage-gated sodium channels typically open, leading to a rapid influx of sodium ions?

<p>-55mV (D)</p> Signup and view all the answers

During the peak phase of an action potential, what contributes to a further influx of sodium ions?

<p>Opening of voltage-gated sodium channels (A)</p> Signup and view all the answers

What process helps balance the membrane potential by allowing potassium ions to exit the neuron?

<p>Repolarization (D)</p> Signup and view all the answers

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