Regarding synaptic structure / function:

• A. small clear vesicles in the presynaptic tunnel contain catecholamines
• B. tetanus toxin causes spastic paralysis by blocking release of ACh at NMJ
• C. chemical mediators located in ???? of presynaptic fibres contain one-way conduction of impulses
• D. the EPSP is an all-or-none response
• E. An I-PSP can be produced by localised increase in membrane permeability to Cl-