Chemical Synapses

Chemical synapses are the standard mode of neuronal communication in mammals. Many studies have been made on their structural, functional, and neurophar-macological properties. They mediate the transfer of neuronal activity by releasing a neuroactive substance of some sort. Along with the law (usually enforced) of dynamic polarization of neurons, they help to establish the one-way traffic of the nervous system. Synapses act as turnstiles that permit activity to pass in one direction only (two-way synapses exist and are now well-known, but these are a pair of oppositely polarized synapses juxtaposed). This unidirectional feature of the chemical synapse is of cardinal importance: the other parts of neural circuits (dendrites, cell bodies, and axons) can and do, in some instances, conduct both ways. Even in the chemical synapse, important effects are exerted by the postsynaptic neuron upon its presynaptic partner (see discussion to follow). Still, the polarity of the chemical synapse largely determines the forward traffic flow seen in most routes and regions of the CNS.

Breaking Bulimia

Breaking Bulimia

We have all been there: turning to the refrigerator if feeling lonely or bored or indulging in seconds or thirds if strained. But if you suffer from bulimia, the from time to time urge to overeat is more like an obsession.

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