Action potentials are produced by the A) opening of ...

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Action potentials are produced by the
 
  A) opening of voltage-activated sodium channels.
  B) closing of ligand-activated chloride channels.
  C) closing of ligand-activated potassium channels.
  D) opening of ligand-activated potassium channels.
  E) closing of voltage-activated calcium channels.

Question 2

The brief period of time immediately after the initiation of an action potential when it is absolutely impossible to initiate another one in the same neuron is called the
 
  A) threshold of excitation.
  B) threshold of inhibition.
  C) absolute refractory period.
  D) IPSP.
  E) relative refractory period.

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Answer to Question 1

Answer: A

Answer to Question 2

Answer: C