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An action potential can be divided into several sequential phases: threshold, rising phase, falling phase, undershoot phase, and recovery.

Following several local graded depolarizations of the membrane potential, the threshold of excitation is reached, voltage-gated sodium channels are activated, which leads to an influx of Na ions.

The Hodgkin–Huxley model of an action potential in the squid giant axon has been the basis for much of the current understanding of the ionic bases of action potentials.

Briefly, the model states that the generation of an action potential is determined by two ions: Na and K .

After neurotransmitters are synthesized, they are packaged and stored in vesicles.

These vesicles are pooled together in terminal boutons of the presynaptic neuron.

Other unipolar neurons found in invertebrates do not even have distinguishing processes such as dendrites.The monologue was utilized to see if the actress could maturely and comfortably handle the film's subject matter.See more » While riding in the helicopter Christian moves the stick to the left and the copter turns to the left.Several techniques such as intracellular recording, patch-clamp, and voltage-clamp technique, pharmacology, confocal imaging, molecular biology, two photon laser scanning microscopy and Ca2 imaging have been used to study activity at the cellular level.Cellular neuroscience examines the various types of neurons, the functions of different neurons, the influence of neurons upon each other, how neurons work together.

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