PSA 4.docx - Pre-Session Assignment(PSA#4 Name Complete the vocabulary-matching sections and at least the first three objectives for each chapter Doing

PSA 4.docx - Pre-Session Assignment(PSA#4 Name Complete the...

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Pre-Session Assignment (PSA) #4 Name ______________________________________________ Complete the vocabulary-matching sections and at least the first three objectives for each chapter. Doing so will prepare you for recitations and for the quizzes. You are highly encouraged to complete the rest of the objectives to keep you on track and so you can ask for clarification during recitation. All answers can be found in the textbook, even if a section has not yet been covered in lecture. Please print, complete, and bring to recitation. Chapter 41 Objectives: Neuronal Signaling 1. Describe the structure of a typical neuron (multipolar) and give the function of each of its regions/parts (drawing helpful! ) - The axon is a long structure that joins the cell body at a junction called the axon hillock. - Many axons are insulated with a fatty substance called myelin. And the myelin helps axons send electrical signal. - Dendrites are fibrous roots that branch out from the cell body. Like antennae, dendrites receive and process signals from the axons of other neurons. 1 _A__ stage in the repolarization time of an action potential when an additional repolarization event is not possible _C__ a branch of an axon _F__ an event that results in the depolarization and formation of an action potential _H__ an event that results in the hyperpolarization of a neuron and the prevention of an action potential _E__ motor neuron _B__ sensory neuron _D__ occurs in unmyelinated axons and is continuous along the length of the axon _G__ support cells of the CNS (not conducting cells) _J__ cell that myelinates neurons in PNS _L__ the neuron leaving a synapse _N__ stage in the repolarization time of an action potential when an additional depolarization event is possible but the threshold level will be higher than during a resting transmembrane potential _I__ combining incoming and outgoing information _K__ cell that myelinates neurons in the CNS _R__ channels that open and close based upon the charge difference across the membrane _O__ movement of an action potential along a myelinated axon where the action potential only occurs at the nodes _Q__ electrical charge difference across a membrane _M__ the neuron leading up to a synapse (the one coming into the synapse) _P__ electrical value at which the voltage-gated sodium channels will be stimulated to open resulting in depolarization A. Absolute Refractory Period B. Afferent Neuron C. Collateral D. Continuous Conductance E. Efferent Neuron F. Excitatory Post Synaptic Potential G. Glial Cells H. Inhibitory Post Synaptic Potential I. Integration J. Neurolemmocyte K. Oligodendrocyte L. Postsynaptic Neuron M. Presynaptic Neuron N. Relative Refractory Period O. Saltatory Conductance P. Threshold Q. Transmembrane Potential R. Voltage-activated Channels
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2. Describe the generation of an action potential and draw and label the events that occur during an action potential, compare and contrast the role of sodium and potassium voltage-gated channels in the generation of an axon potential, and explain what happens if either is blocked or stimulated 3. Compare and contrast an absolute refractory period with a relative refractory period
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