Chapter 08: Nervous System Fehrenbach: Illustrated Anatomy of the Head and Neck, 5th Edition MULTIPLE CHOICE 1. Which of the following effects is prevented from occurring on the target nerve during the
administration of a local anesthetic agent? a. Resting potential b. Action potential c. Refractory period d. Repolarization ANS: B
A
B
C D
Feedback The resting potential occurs when the difference in charge exists and the outside of the nerve cell membrane has a positive charge, while the inside has a negative charge. It occurs in the nonstimulated nerve. Local anesthetic agents are administered to prevent an action potential, which is a rapid depolarization of the nerve cell membrane resulting in generation of a nerve impulse. An action potential temporarily reverses the resting potential that exists. The refractory period refers to a brief period after an action potential, during which the nerve CANNOT be stimulated. The repolarization reestablishes the resting potential.
DIF: Comprehension REF: p. 174 OBJ: 2 TOP: CDA: General Chairside, I. A. Demonstrate understanding of basic oral and dental anatomy, physiology, and development MSC: NBDHE, Scientific Basis for Dental Hygiene Practice, 1.1 Anatomy | NBDHE, Scientific Basis for Dental Hygiene Practice, 2.0 Physiology 2. Sympathetic and parasympathetic nerves are antagonistic to one another. BOTH nerve
systems function as part of the somatic nervous system. a. Both statements are true. b. Both statements are false. c. The first statement is true; the second is false. d. The first statement is false; the second is true. ANS: C
A B C D
Feedback Although the nerves are antagonistic to one another, they are part of the autonomic nervous system, NOT the somatic nervous system. Although the nerves are antagonistic to one another, they are part of the autonomic nervous system, NOT the somatic nervous system. Although the nerves are antagonistic to one another, they are part of the autonomic nervous system, NOT the somatic nervous system. Although the nerves are antagonistic to one another, they are part of the
