Neurophysiology and Neurochemistry Quiz

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Questions and Answers

Which type of cells are responsible for supporting and maintaining neural structure?

  • Myelinated neurons
  • Oligodendrocytes (correct)
  • Axon hillocks
  • Glial cells

What is the main way that neurons communicate with each other?

  • Gap junctions
  • Axon terminals
  • Electrical communication
  • Chemical synapses (correct)

Which type of potential is a small positive change in potential?

  • Inhibitory postsynaptic potential (IPSP)
  • Action potential
  • Excitatory postsynaptic potential (EPSP) (correct)
  • Postsynaptic potential

What is the function of myelin in neurons?

<p>To protect and speed up electrical signals (A)</p> Signup and view all the answers

What occurs when the action potential reaches the presynaptic boton?

<p>Calcium channels open up (A)</p> Signup and view all the answers

Which type of summation involves multiple inputs from several neurons?

<p>Spatial summation (A)</p> Signup and view all the answers

What occurs when a sufficient IPSP is present?

<p>The likelihood of generating an action potential is reduced (B)</p> Signup and view all the answers

What happens to unbound neurotransmitters in the synapse?

<p>They are cleared through endocytosis (C)</p> Signup and view all the answers

Which of the following statements accurately describes the resting membrane potential?

<p>The resting membrane potential is the result of a difference in electrical charge across the membrane. (C)</p> Signup and view all the answers

Which of the following accurately describes the action potential?

<p>The action potential is the result of the opening of sodium channels and the influx of positive ions. (B)</p> Signup and view all the answers

What is the function of the myelin sheath?

<p>The myelin sheath insulates the axon, allowing for faster propagation of the action potential. (C)</p> Signup and view all the answers

What are the nodes of Ranvier?

<p>The nodes of Ranvier are gaps in the myelin sheath where the action potential is regenerated. (C)</p> Signup and view all the answers

What is the role of refractory periods in neuronal firing?

<p>Refractory periods prevent neurons from firing constantly. (B)</p> Signup and view all the answers

What causes multiple sclerosis?

<p>Multiple sclerosis is caused by the degradation of oligodendrocytes by the immune system. (A)</p> Signup and view all the answers

What is saltatory conduction?

<p>Saltatory conduction is the process of action potential propagation along the axon by jumping between nodes of Ranvier. (A)</p> Signup and view all the answers

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