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Back Print Name Class Date Skills Worksheet Concept Mapping Using the terms and phrases provided below, complete the concept map showing the structures of the nervous system. central nervous system parasympathetic division spinal cord interneurons peripheral nervous system sympathetic division motor neurons somatic nervous system synapses neurons Nervous system consists of is divided into 1. which communicate across 2. 3. which is divided into which consists of which includes 4. 5. brain 6. autonomic nervous system using signal molecules called nerves which contains neurotransmitters 7. which contain which link sensory neurons to 8. which is divided into 9. 10. Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt Biology 25 Nervous System Back Print TEACHER RESOURCE PAGE 2. Reaction times increase and coordina- and temperature, are carried by A fibers. Motor impulses to skeletal muscles are also carried by A fibers. These types of impulses relay information about the external surroundings and how the body will respond to external stimuli. The speed with which these impulses are carried could reduce the incidence of injury to the body by allowing for a quick reaction to a stimulus. 3. Student answers will vary. Sample answer: Two factors that influence the speed with which an impulse is conducted are the diameter of the axon and whether or not it is myelinated. In the absence of myelination, increasing the diameter of the axon will increase the speed of impulse conduction. The large axons in the organisms are responsible for the escape or withdrawl reflexes. tion, judgment, and speech become impaired. 3. Alcohol is absorbed into the blood through the stomach and small intestine. 4. a Vocabulary Review 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. d f b e a c i g h motor neuron cerebrum central nervous system thalamus spinal cord peripheral nervous system sensory neuron brain hypothalamus interneurons brain stem cerebellum reflex f a c g d b e tolerance depressant stimulant psychoactive drugs withdrawal addiction INTERPRETING SCIENTIFIC ILLUSTRATIONS 4. 5. 6. 7. 8. 9. axon terminal neurotransmitter molecule drug molecule reuptake receptor receptor protein The drug molecule binds to the reuptake receptor that would normally remove the neurotransmitter molecules from the synapse and end the impulse. As a result, the impulse continues and the postsynaptic neuron is overstimulated. Concept Mapping 1. 2. 3. 4. 5. 6. 7. 8. 9. neurons central nervous system peripheral nervous system synapses somatic nervous system spinal cord interneurons motor neurons sympathetic division or parasympathetic division 10. sympathetic division or parasympathetic division Science Skills INTERPRETING DATA 1. The larger the diameter of the axon, the faster it conducts impulses. 2. Student answers will vary but may include the idea that sensory impulses from the skin, such as touch, pressure, Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt Biology 81 Nervous System