Specify which concepts coined by Ramon y Cajal (1906), Sherrington (1932), and Dale and Loewi (1936) contribute to the following aspect of synapse structure and/or function? In addition to matching the name to the discovery, briefly explain the actual contribution and/or experimental evidence. A. Neurophysiologically: the neuronal circuit and its implications to the concept of a neuronal circuit as a functional unit of the nervous system. B. Neurochemically: the release of neurotransmitters as a result of afferent stimulation. C. Structurally: The synapse as a physical gap between two neurons.