The following graph depicts demand. 
Refer to the figure above.The price elasticity of demand at point C is:
Definitions:
Excitation Threshold
The voltage difference between a neuron’s interior and exterior that, if exceeded, causes the neuron to fire.
Action Potential
A temporary reversal of electric polarization of the membrane of a nerve cell or muscle cell, involved in the transmission of signals.
Nodes of Ranvier
Gaps in the myelin sheath of nerve fibers that facilitate the rapid conduction of electrical impulses along the neuron.
Myelinated Neuron
A nerve cell that features a myelin sheath around its axon, enhancing the speed of electrical transmission of signals.
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