A spring has a natural length of 
cm.If a force of 
N is required to keep it stretched to a length of 
cm, how much work is required to stretch it from cm to cm? 
Definitions:
Postsynaptic Membrane
The part of the nerve cell membrane that is on the receiving end of a synapse, responding to neurotransmitters released by the presynaptic neuron.
Synaptic Cleft
The narrow gap between the terminal end of a neuron and the neighboring neuron or muscle cell, across which neurotransmitters are released to transmit signals.
Schwann Cell
A type of glial cell that forms the myelin sheath around nerve fibers in the peripheral nervous system.
Neuron Cell Body
Enlarged portion of the neuron containing the nucleus and other organelles; also called nerve cell body.
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