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Physiology Lecture Notes – Nervous System Recap Essay Preview: Physiology Lecture Notes – Nervous System Recap Report this essay Lecture 4 -Autonomic Nervous SystemNervous system recapCentralPeripheralSomatic Has one neuron AutonomicHas two neuronsSympathetic – fight or flight, for survivalNeurotransmitter released at ganglionAcetyl choline released pre and post ganglionic neuronnorepinepherineParasympathetic – active when calm, preserves energyNeurotransmitterAcetyl choline.