<em>The proteins in the cell membrane allow substances to come or go based on their concentrations. This is an important part of </em><u><em>Homeostasis </em></u><em>which maintains the immediate conditions necessary for life.
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well for one you can find a lot for examples like if the light of a blazing hot sun was reflecting on a wooden stick the spot where the sun is reflecting would have a red mark with smoke comming out the stop
The dendrites. They are the ones that receive information from the previous neuron. (is the post-synaptic membrane) The post-synaptic membrane receives a signal from the pre-synaptic membrane. (axon terminal)