Exam_3_2009_Dr. Govindarajan_Answerkey

Exam_3_2009_Dr. Govindarajan_Answerkey - PHRM3450: EXAM 3...

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PHRM3450: EXAM 3 (SEP 29, 2009) ANSWERS KEY Intro Neurophys (I, II); Brain-Cranial nerves (I, II) and Spinal cord-Spinal nerves (I, II) Each of the following questions only has 1 correct answer. Choose the best answer for each question and mark it in the scantron sheet provided. Each question carries 1.5 points (Total 50 x 1.5 = 75 points) 1. Which of the following is NOT a part of the peripheral nervous system? A. Cranial nerve B. Ganglion C. Spinal cord D. Spinal nerve 2. The sympathetic and parasympathetic divisions are subdivisions of the A. Afferent nervous system B. Autonomic nervous system C. Central nervous system D. Somatic nervous system 3. Which of the following effectors is/are NOT innervated by the autonomic nervous system? A. Cardiac muscle B. Glands C. Skeletal muscle D. Smooth muscle 4. Which one of the following types of neuroglial cells is found in the peripheral nervous system? A. Microglia B. Schwann cells C. Oligodendrocytes D. Astrocytes 5 . Which of the following types of neuroglia are found in the choroid plexus of the ventricles of the brain, and produce cerebrospinal fluid? A. Astrocytes B. Microglia C. Ependymal cells D. Oligodendrocytes 6. Nodes of Ranvier are A. Interruptions in the myelin sheath along the course of a myelinated axon B. Collections of immune cells in the CNS C. Satellite cells that support cell bodies in ganglia D. Gaps between choroid plexuses where cerebral spinal fluid emerges 1
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7. When a nerve cell membrane changes from positive inside to negative inside, the cell membrane is undergoing A. Depolarization B. Repolarization C. Tetany D. Treppe 8. Which type of propagation occurs along a myelinated axon? A. Continuous B. Treppe C. Saltatory D. Migratory 9. Which one of the following statements is NOT true concerning the resting membrane potential? A. The membrane is relatively more permeable to potassium ions than to sodium ions B. Potassium ions are constantly moving out of the cell down their concentration gradient C. Sodium ions are in relatively higher concentration inside the cell than outside D. The membrane is relatively permeable to chloride ions 10. During the repolarization phase of an action potential, which of the following is the primary activity? A. Sodium ions are flowing out of the cell B. Sodium ions are flowing into the cell C. Potassium ions are flowing into the cell D. Potassium ions are flowing out of the cell 11. The one-way nature of action potential propagation down an axon is primarily due to A. Sodium ion depletion B. Potassium ion depletion C. The refractory period D. ATP loss 12. A supramaximal stimulus produces which of the following? A. The fastest muscle contraction possible B. A muscle contraction that is slower than one produced by maximal stimulus C. A greater frequency of action potentials than a maximal stimulus D. None of the above 2
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13. Which of the following types of stimuli produces only a local potential, but not an action potential? A. Maximal
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Exam_3_2009_Dr. Govindarajan_Answerkey - PHRM3450: EXAM 3...

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