At Chemical Synapses, Most of the Synaptic Delay (The Time

question 59

Multiple Choice

At chemical synapses, most of the synaptic delay (the time between the arrival of a presynaptic action potential and the appearance of a postsynaptic EPSP or IPSP) is attributable to the

• A) the time needed for Ca²⁺ to enter the terminal and the vesicles to fuse.
• B) rate of diffusion of neurotransmitter molecules across the synapse.
• C) rate at which vesicles move to the presynaptic membrane and rupture.
• D) interaction of the transmitter with its receptors.

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