An area that contains many synaptic vesicles filled with acetylcholine A structure that when bound to a ligand opens a divalent channel for the movement of both Na and K A change in membrane voltage that travels down the T-tubule to cause opening of Ca2 channels An area of muscle fiber membrane that is in close association with the axon terminal of the motor neuron, contain receptors for acetylcholine:

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

The correct answer is  b) 

They are both used to view parts of the cell