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Cellular neuroscience is the study of neurons at a cellular level.

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Once bounded with Ca2 , the vesicles dock and fuse with the presynaptic membrane, and release neurotransmitters into the synaptic cleft by a process known as exocytosis.

The neurotransmitters then diffuse across the synaptic cleft and bind to postsynaptic receptors embedded on the postsynaptic membrane of another neuron.

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 .

There are two families of receptors: ionotropic and metabotropic receptors.

Ionotropic receptors are a combination of a receptor and an ion channel.

Some neurons such as photoreceptor cells, for example, do not have myelinated axons that conduct action potentials.

Other unipolar neurons found in invertebrates do not even have distinguishing processes such as dendrites.

Neurons are cells that are specialized to receive, propagate, and transmit electrochemical impulses.

In the human brain alone, there are over eighty billion neurons.

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

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