Glutamate and GABA in the CNS
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Questions and Answers

Which neurotransmitter is characterized as a major inhibitory transmitter in the CNS?

  • Glutamate
  • Kainic acid
  • Gamma-aminobutyric acid (GABA) (correct)
  • Aspartate

Which type of glutamate receptor subtype is coupled to G proteins and leads to long-term changes in neuronal functions/neuronal plasticity?

  • NMDA receptors (correct)
  • AMPA receptors
  • Kainic acid receptors
  • Delta receptors

What is the effect of GABAA receptor activation?

  • Sodium ion efflux
  • Chloride ion influx and subsequent hyperpolarization (correct)
  • Neuronal excitation
  • Potassium ion influx

Which amino acid is characterized as an excitatory amino acid found in very high concentrations in the brain?

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

What is the major role of glutamate in the CNS?

<p>Neuronal excitation (B)</p> Signup and view all the answers

Which type of glutamate receptor subtype is characterized as an ionotropic receptor?

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

What type of receptor is the GABAA receptor?

<p>Ligand-gated Cl- ion channel (C)</p> Signup and view all the answers

Which ion enters the neuron upon activation of the GABAA receptor?

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

What are the two major excitatory amino acids found in very high concentrations in the brain?

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

Which type of glutamate receptor subtype is named after its most selective agonist that activates it?

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

What type of receptor is the NMDA receptor?

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

What happens when NMDA receptors are activated due to high/sustained stimulation?

<p>Mg2+ ion block is removed; Na+ and Ca2+ enter neuron (C)</p> Signup and view all the answers

What is the primary mechanism of action of GABAB receptor activation?

<p>Increases conductance of an associated K+ channel (A)</p> Signup and view all the answers

Which class of adjuvant analgesics acts by inhibiting norepinephrine and serotonin reuptake?

<p>Tricyclic Antidepressants (TCAs) (A)</p> Signup and view all the answers

What is the major site of action for gabapentin in providing analgesia?

<p>Presynaptic nerve terminals (C)</p> Signup and view all the answers

What is the primary action of NMDA receptor antagonists in the context of pain management?

<p>Inhibit central sensitization (C)</p> Signup and view all the answers

Which class of drugs is primarily used to counter the effects of peripheral sensitization?

<p>Antiepileptic Drugs (AEDs) (A)</p> Signup and view all the answers

What is the mechanism of action underlying the use of capsaicin as an analgesic?

<p>Activates TRPV1 receptors (C)</p> Signup and view all the answers

What is the purported effect of rubefacients upon application?

<p>Induce analgesia (B)</p> Signup and view all the answers

What is the major site of action for TCA-associated analgesia?

<p>Presynaptic reuptake receptors (D)</p> Signup and view all the answers

Which neurotransmitter is primarily affected by the mechanism of action of GABAB receptor activation?

<p>GABA (B)</p> Signup and view all the answers

What is the primary pharmacokinetic characteristic of gabapentin?

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

What is the mechanism of action underlying the use of menthol as an analgesic?

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

What is the primary site of action for NMDA receptor antagonists in pain management?

<p>Postsynaptic nerve terminals (C)</p> Signup and view all the answers

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