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If more of the same type of postsynaptic receptors are activated, then more Na will enter the postsynaptic membrane and depolarize cell.Metabotropic receptors on the other hand activate second messenger cascade systems that result in the opening of ion channel located some place else on the same postsynaptic membrane.Thus, not all neurons correspond to the stereotypical motor neuron with dendrites and myelinated axons that conduct action potentials.
The undershoot phase occurs because unlike voltage-gated sodium channels, voltage-gated potassium channels inactivate much more slowly.
Nevertheless, as more voltage-gated K channels become inactivated, the membrane potential recovers to its normal resting steady state..
After neurotransmitters are synthesized, they are packaged and stored in vesicles.
Since memories are postulated to be represented by vastly interconnected networks of synapses in the brain, synaptic plasticity is one of the important neurochemical foundations of learning and memory (see Hebbian theory).
Plastic change often results from the alteration of the number of neurotransmitter receptors located on a synapse.
This includes morphology and physiological properties of single neurons.