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Unformatted text preview: at the trigger zone, then the neuron will fire an action potential. The net summation of postsynaptic potentials in the trigger zone determines whether a neuron will fire an AP. Two types of summation are important in neuronal signaling. Temporal summation occurs when a single synapse receives many inputs in a short period of time (high frequency). In contrast, spatial summation occurs when a single cell receives signals from many presynaptic cells. Often information in the nervous system need to be integrated and processed by one or a group of neurons. This is the principle of convergence . Several inputs into one cell will determine if that cell fires an AP and passes along the information. Similarly, a single cell can release NTs onto several different cells and cause a divergence in the information pathway....
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- Fall '10
- Anatomy, Chemical synapse, trigger zone