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Unformatted text preview: other side of the brain from the origin of sensory stimuli. 10. Muscle spindles would send signals through this tract. 11. An interneuron in a withdrawal reflex would send a fiber through this tract. ---------------------------------------------------------------------------------------------------------------------------------------------------12. The extrapyramidal tracts: (A) carry signals which go to the voluntary muscles, (B) carry signals which are responsible for maintaining balance and muscle bone, (C) originate in a part of the brain, (D) all of the above, (E) B and C only. 13. The conductive region is characterized by having: (A) chemically-gated ion channels, (B) voltage-gated ion channels, (C) both chemically and voltage gated ion channels, (D) vesicles of neurotransmitter, (E) both C and D. ----------------------------------------------------------------------------------------------------------------------------------------------------Questions 14 through 18 Matching: Refer to action potential diagram below: NOTE: A through G indicate levels of membrane polarity; H and I indicate time periods. 14. At this membrane polarity Na+ activation gates open. Use letters A-G from the diagram. 15. This is the point at which voltage-gated K+ channels open. Use letters AG from the diagram. 16. Na+ activation gates are closed and inactivation gates are open at this point. Use letters A-G from the diagram. 17. The membrane cannot be stimulated during this period. Use H or I only 18. This indicates hyperpolariztion. Use letters A-F from the diagram. ----------------------------------------------------------------------------------------------------------------------------------------------------19 through 23 Matching. Match the nerve below with the correct description. Not all letters are used. (A) axillary, (B) phrenic,, (C) pudendal, (D) obturator, (E) radial, (F) ulnar, (G) peroneal. 19. If this nerve is blocked you would loose sensation from the external genitalia. 20. If this nerve is damaged you could not breathe on your own. 21. Inflammation of this nerve would impair elbow extension. 22. The dorsiflexor muscles are innervated by this nerve. 23. This nerve comes from the lumbar plexus. class=Section2> ---------------------------------------------------------------------------------------------------------------------------------------------------Questions 24 through 30 apply to the following diagram of the spinal cord cross section: 24. Which area would contain oligodendrocytes? (A) 6, (B) 7, (C) 8, (D) 9. 25. Which area would contain most astrocytes? (A) 6, (B) 7, (C) 8, (D) 9. 26. Which are multipolar neurons? (A) 3, (B) 10, (C) 14, (D) A and B, (E) B and C. 27. Motor neuron axons are indicated by: (A) 1, (B) 12, (C) 14 28. Ependymal cells would be found in: (A) 6, (B) 7, (C) 8, (D) 9. class=Section3> 29. When a stretch reflex is operating with Muscle A, which of the following is true about its antagonist B? (A) A stretch reflex is also operating with B, (B) a tendon reflex is operating with B, (C) Mu...
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