Exam 2 Spring 2008 - Examination II VPHY 3100 Elements of...

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KEY : Examination II VPHY 3100 Elements of Physiology February 25th, 2008 1:25 - 2:15 p.m. Multiple Choice (2.5 points each) FOR EACH QUESTION, CHOOSE THE SINGLE BEST ANSWER 1. The autonomic and somatic motor systems share which of the following features? A. Paired motor neurons, one preganglionic and one postganglionic, comprise the efferent pathway. B. Some components of the system lie within the CNS and others lie within the PNS. C. Efferent neurons generally exit the spinal cord via the dorsal roots. D. Some efferent axons travel to the periphery via the splanchnic nerves. E. All motor neuron cell bodies lie within the gray matter of the spinal cord. 2. Which of the following statements accurately describes an anatomical difference between the sympathetic and parasympathetic divisions of the ANS (autonomic nervous system)? A. Sympathetic preganglionic axons are generally longer than parasympathetic preganglionic axons. B. Parasympathetic preganglionic fibers originate in the brain and most inferior portions of the spinal cord, whereas sympathetic preganglionic fibers originate in the central regions of the spinal cord. C. Most sympathetic ganglia are located near their target tissues, whereas many parasympathetic ganglia are located in a chain of ganglia lining either side of the spinal cord. D. Both A and B are accurate. E. Both B and C are accurate. 3. Which of the following statements is TRUE of the sympathetic division of the autonomic nervous system? A. Both pre- and post-ganglionic fibers are typically cholinergic. B. The vagus nerve is a primary route by which effector organs are innervated. C. Stimulation of the vagus nerve decreases the heart rate via muscarinic- receptor activation at cardiac cells. D. Stimulation of sympathetic nerves causes pupil dilation via α 1 - adrenergic stimulation of the radial muscles of the iris. E. Preganglionic fibers synapse with postganglionic fibers in terminal ganglia which lie close to or within target organs. 4. Which of the following organs is NOT innervated by the parasympathetic division of the autonomic nervous system? A. adrenal medulla B. heart C. lungs D. gastrointestinal tract E. bladder 1
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5. The major post-ganglionic neurotransmitter of the parasympathetic division of the ANS is: A. norepinephrine. B. epinephrine. C. dopamine. D. GABA. E. acetylcholine. 6. The major post-ganglionic neurotransmitter of the sympathetic division of the ANS is: A. norepinephrine. B. epinephrine. C. dopamine. D. GABA. E. acetylcholine. 7. Vagal stimulation leads to increased constriction of the bronchioles but decreased contractility of the heart because: A. α -adrenergic receptors mediate the former effect whereas muscarinic receptors mediate the latter effect. B.
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Exam 2 Spring 2008 - Examination II VPHY 3100 Elements of...

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