Bethany Carter
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Nursing Quiz on Action Potential and Neuronal Synaptic Connections, created by Bethany Carter on 14/02/2018.

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Bethany Carter
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Action Potential and Neuronal Synaptic Connections

Question 1 of 13

1

Sodium is higher in the extracellular space than in the cell body of neurons, causing a chemical gradient favoring the influx of sodium into the cell.

Select one of the following:

  • True
  • False

Explanation

Question 2 of 13

1

Resting membrane potential in the cell body of a neuron is

Select one of the following:

  • -40 mV

  • -90 mV

  • -65 mV

Explanation

Question 3 of 13

1

What mechanism is responsible for creating the chemical charge of the membrane potential?

Select one of the following:

  • Na-K ATPase

  • Fight or flight mechanism of ANS

  • IPSP

Explanation

Question 4 of 13

1

In which of the following ways can an excitatory postsynaptic potential (EPSP) occur?

Select one or more of the following:

  • Opening of sodium channels

  • Opening of chloride channels

  • Closing of potassium channels

  • Changes to intracellular structure such as an increase in number of excitatory membrane receptors.

Explanation

Question 5 of 13

1

Action potentials are "all or nothing."

Select one of the following:

  • True
  • False

Explanation

Question 6 of 13

1

Which are stages of an action potential?

Select one or more of the following:

  • Resting stage (-90 mV)

  • Depolarization stage (-70 to -50 mV)

  • Absolute refractory period (-110 mV)

  • Repolarization

Explanation

Question 7 of 13

1

What is the difference between an absolute refractory period and a relative refractory period?

Select one of the following:

  • In a relative refractory period, only a small action potential can be generated.

  • There is no difference, they are two names for the same concept.

  • During an absolute refractory period the neuron is completely unable to generate an action potential.

Explanation

Question 8 of 13

1

During repolarization, ligand-gated sodium channels close and potassium channels open.

Select one of the following:

  • True
  • False

Explanation

Question 9 of 13

1

An action potential can be said to be self-propagating.

Select one of the following:

  • True
  • False

Explanation

Question 10 of 13

1

How are myelin sheaths formed?

Select one or more of the following:

  • Via oligodentricytes

  • Via glia

  • Via Swann cells

  • Via astrocytes

Explanation

Question 11 of 13

1

Which ion is responsible for binding and docking of synaptic vessels at the terminal bouton?

Select one of the following:

  • Sodium

  • Calcium

  • Chloride

  • Acetylcholine

Explanation

Question 12 of 13

1

Spatial summation refers to the successive discharges from a single presynaptic terminal.

Select one of the following:

  • True
  • False

Explanation

Question 13 of 13

1

In which ways are the influence of ESPS limited or nullfied?

Select one or more of the following:

  • Ligand-gated activation of G-protein

  • Decremental conduction as ESPS moves away from the cell body

  • Postsynaptic inhibition by release of GABA

  • Decrease in the number of inhibitory receptors on the cell membrane

Explanation

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