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A higher concentration of Ca enables synaptic vesicles to fuse to the presynaptic membrane and release their contents (neurotransmitters) into the synaptic cleft to ultimately contact receptors in the postsynaptic membrane.
This willingness appears to be due to ablation of a bristle field of contact receptors in the duck or denervation, or loss of nerve supply, to the spermatheca, or alternatively it is due to the severance of the ventral nerve cord.