4 Quiz info

4 Quiz info - Lesson 4 Quiz Information and explanations...

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Lesson 4 Quiz Information and explanations for selected questions The average on this quiz was 71.67% and the distribution of scores is illustrated in the graph. Two students scored 90% or above. 0 1 2 3 4 5 6 Number 90 - 100 80 - 89 70 - 79 60 - 69 50 - 59 40 - 49 30 - 39 20 - 29 19 -10 0 - 9 Scores Lesson 4 Quiz Performance Below are explanations for the more difficult questions. If you have further questions with these or with other questions on the quiz, please post your questions in Lesson 4 Discussion Forum (or email me). Use Figure 1 of a simple neural circuit consisting of 3 neurons labeled A, B, and C to answer questions 1 through 4. Arrows L, M, N, and O are pointing to regions of neuron A. Arrow * is pointing to neuron C’s axon and neuron C’s terminals are not shown. Assume that the neurons are typical of those discussed in the Lesson and textbook.
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Figure 1 Let’s first attempt to classify each neuron as an afferent neuron, an interneuron, or a somatic efferent neuron. First of all, none of the neurons are afferent neurons. How do we know that? Primary afferent neurons do not have dendrites and are represented in the following ways. An afferent neuron is circled in the figure below from the textbook. In addition, the Neurons 1 and 2 below (from Lesson 4 Outline) are afferent neurons.
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None of the neurons in the figure have the morphology (shape) of an afferent neuron. This line of reasoning was necessary to answer several questions in Lesson 4 Practice Set, Part 2. Neuron A forms synapses on neurons B and C but not on skeletal muscle cells. Therefore, A cannot be a somatic motorneuron. A must be an interneuron. Neuron B forms a synapse on neuron C but not on skeletal muscle cells. Therefore, B cannot be a somatic motorneuron. B must be an interneuron. Neuron C’s terminals are not shown, as indicated in the information provided. So neuron C could form synapses on other neurons or on skeletal muscle cells. Therefore, C could be an interneuron or a somatic motorneuron. #2. _____ could be an interneuron. Because of the reasoning above, A, B, and C could be interneurons. #3. The soma of neuron ____ could be in a dorsal root ganglion. Only primary afferent neurons have cell bodies in dorsal root ganglia. None of the neurons are afferent neurons. Therefore, the answer is “None of the above”. #4. Which statement is correct about the arrows and neuron A?
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4 Quiz info - Lesson 4 Quiz Information and explanations...

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