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

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.