Chemical and electrical processes used in neurotransmission

Describe the chemical and electrical processes used in neurotransmission. Why are depolarizations referred to as excitatory postsynaptic potentials and hyperpolarization as inhibitory postsynaptic potentials? What are the differences between absolute and relative refractory periods? Responses need to address all components of the question, demonstrate critical thinking and analysis and include peer-reviewed journal evidence to support the student’s position.