Determine whether the given function is a probability density function on the specified interval. 
Definitions:
Action Potential
A temporary reversal of the electrical polarization of the membrane of a neuron or muscle cell, allowing for the transmission of signals.
Neuron
A cell of the nervous system that transmits information through electrical and chemical signals.
Postsynaptic Potential
A change in membrane potential of the postsynaptic terminal of a synapse, typically induced by the binding of neurotransmitters.
Neurotransmitters
Chemical substances that transmit signals across a synapse from one neuron to another in the brain and nervous system.
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