[Campbell Biology P.1129] Which of the following statements accurately describes a mechanism ... | Practice Question

Which of the following statements accurately describes a mechanism for terminating neurotransmission, as detailed or depicted in the provided text and figure?

  • A: Enzymatic breakdown of neurotransmitters in the synaptic cleft by inactivating enzymes.
  • B: Irreversible binding of neurotransmitters to postsynaptic receptors, causing receptor desensitization.
  • C: Active transport of neurotransmitters from the postsynaptic neuron back to the presynaptic neuron.
  • D: Secretion of new enzymes by the postsynaptic neuron to neutralize neurotransmitters.
  • E: Changes in membrane potential of the presynaptic neuron, preventing further release.

Explanation

The text and Figure 48.18 describe two primary mechanisms for terminating neurotransmission: enzymatic breakdown of neurotransmitters in the synaptic cleft a and reuptake of neurotransmitters into the presynaptic neuron b . Option A correctly describes one of these mechanisms.