What are the orders of magnitude in synapses ?

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I'm looking for an order of magnitude or typical intervals (with references) on:
   the number of postsynaptic receptors (in most of synapses);
   the number of presynaptic  vesicles;
   the number of presynaptic  vesicles activated by one action potential;
   the number of transmitters released by one vesicle.

Thanks for your help.

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Nicolas Chambet

Université d'Angers.
Institut de Biologie Théorique 
10, rue A. Boquel
49100 Angers

chambet @ ibt.univ-angers.fr

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