Question

which of these does not contribute to the cessation of the signal in a synaptic transmission?
multiple choice
synaptic vesicles secrete neurotransmitter by exocytosis.
neurotransmitter escapes from the synapse into the nearby extracellular fluid.
neurotransmitters are no longer released.
the axon terminal reabsorbs some neurotransmitters by endocytosis.
enzymes in the postsynaptic cell break down some neurotransmitters.

Explanation:

Synaptic vesicles secreting neurotransmitter by exocytosis is part of the signal transmission process (sending the signal), not the cessation. Neurotransmitter escaping into extracellular fluid, no longer being released, re - absorption by endocytosis, and enzymatic breakdown in the postsynaptic cell all contribute to stopping the signal.

Answer:

Synaptic vesicles secrete neurotransmitter by exocytosis.