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NeuronalSignaling_BigIdea&WordList - voltage-gated...

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p. 1 Lecture 2/16/12 Chapter 48 Neuronal Signaling Big Questions / Learning Objectives 1. Distinguish among sensory neurons, interneurons, and motor neurons. 2. List and describe the major parts of a neuron and explain the function of each. 3. Define a membrane potential and a resting potential. 4. Describe the factors that contribute to a membrane potential, including non- gated channels and the sodium-potassium pump. 5. Using the results of applying the Nernst equation to model membranes, explain why the membrane potential of a resting neuron is typically in the range of -60 to -80 mV. 6. Distinguish between gated and ungated ion channels and among stretch- gated ion channels, ligand-gated ion channels, and voltage-gated ion channels. 7. Describe the characteristics of an action potential. Explain the role of
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Unformatted text preview: voltage-gated ion channels in this process. 8. Define the refractory period and its role in unidirectional propagation of action potentials. 9. Explain how an action potential is propagated along an axon. Topic / Working Vocabulary List action potential axon axon hillock* cell body depolarization gated ion channel glia hyperpolarization inactivation interneuron ligand-gated ion channel membrane potential motor neuron neuron neurotransmitter postsynaptic cell* potassium channel presynaptic cell* refractory period resting potential sensory neuron sodium channel stretch-gated ion channel synapse synaptic terminal threshold voltage-gated ion channel *Covered in assigned reading and homework rather than lecture...
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