A synapse is a space where a nerve impulse travels between what?
Chemical synapse concentration to be raised and lowered rapidly. An autapse is a chemical (or electrical) synapse formed when the axon of one neuron synapses with its own dendrites. Here is a summary of the sequence of events that take place in synaptic transmission from a presynaptic neuron to a postsynaptic cell. Each step is explained in more detail below. Note that with the exception of the final step, the entire process may run only a few hundred microseconds, in the fastest synapses. The release of a neurotransmitter is triggered by the arrival of a nerve impulse (or action potential) and occurs
Nerve of a covering intersections as formula_12. By considering the natural maps formula_13 and formula_14, we can construct a simplicial object formula_15 defined by formula_16, n-fold fibre product. This is the Čech nerve, and by taking connected components we get a simplicial set, which we can realise topologically: formula_17. If the covering and the space are sufficiently nice, for instance if formula_8 is compact and all intersections of sets in the cover are contractible or empty, then this space is weakly equivalent to formula_8. This is known as "the nerve theorem". Nerve of a covering In topology, the nerve of an open covering is