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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.
Although slower than ionotropic receptors that function as on-and-off switches, metabotropic receptors have the advantage of changing the cell's responsiveness to ions and other metabolites, examples being gamma amino-butyric acid (inhibitory transmitter), glutamic acid (excitatory transmitter), dopamine, norepinephrine, epinephrine, melanin, serotonin, melatonin, and substance P.
In neuroscience, synaptic plasticity is the ability of synapses to strengthen or weaken over time, in response to increases or decreases in their activity.
As Na ions enter the cell, the membrane potential is further depolarized, and more voltage-gated sodium channels are activated.These vesicles are pooled together in terminal boutons of the presynaptic neuron.When there is a change in voltage in the terminal bouton, voltage-gated calcium channels embedded in the membranes of these boutons become activated.Other unipolar neurons found in invertebrates do not even have distinguishing processes such as dendrites.Moreover, the distinctions based on function between neurons and other cells such as cardiac and muscle cells are not helpful.