Final answer:
The synapse between post-ganglionic ANS neurons and effector cells is a chemical synapse, where neurotransmitters are released to communicate with the effector cells.
Step-by-step explanation:
The type of synapse formed between post-ganglionic neurons of the autonomic nervous system (ANS) and effector cells is a chemical synapse. Unlike electrical synapses, chemical synapses involve the release of neurotransmitters from the presynaptic neuron, which then bind to receptors on the postsynaptic cell, initiating a response. This could be in the form of activation or inhibition depending on the type of neurotransmitter and receptor. In contrast, electrical synapses involve direct ionic transfer through gap junctions, and while they exist in all nervous systems, they are less common than chemical synapses.