NROS 307 Midterm: Neurotransmitters - Lecture 19 and 20 Exam Study Questions_AF
19 Oct 2016
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Neurotransmitters - lecture 19 and 20 study questions. Why is it not totally correct to define a neurotransmitter as being other excitatory or inhibitory. Because it depends on the pathway that it is involved. List at least four criteria that must be met before a substance is accepted as a neurotransmitter: It is present in the presynaptic terminal and is released in amounts sufficient to exert a defined action on the postsynaptic neuron or effector organ. When administered exogenously in reasonable concentrations it mimics the action of the endogenous transmitter (for example it activates the same ion channels or second messenger pathway in the post synaptic cell) A specific mechanism usually exists for removing the substance from the synaptic cleft. No is a gas that easily diffuses across membranes. It"s considered an unconventional nt because it is not released by exocytosis and it is not regulated by conventional receptor molecules.
