Q: In chemical synapses, what is the name of the fluid-filled space between the pre- and post-synaptic neurons?  

Answer: A

The synaptic cleft is the fluid-filled space that separates the membranes of the pre- and post-synaptic neurons at chemical synapses. The transmission of impulses at these synapses involves the release of neurotransmitters from the pre-synaptic neuron into the synaptic cleft, which then bind to receptors on the post-synaptic neuron to initiate a response. Gap junctions, on the other hand, are found at electrical synapses and allow for direct communication between the cytoplasm of adjacent cells. Synapse is a general term used to describe the junction between two neurons or a neuron and a target cell. Synaptic vesicles are small membranous sacs found in the pre-synaptic neuron that contain neurotransmitters.

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