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Chapter 02: Neurophysiology
Logothetis: Local Anesthesia for the Dental Hygienist, 2nd Edition
MATCHING
Match each description with the term that correctly identifies the generation and conduction of
the nerve impulse stage. Terms may be used more than once.
a. Polarization
b. Slow depolarization
c. Rapid depolarization
d. Repolarization
e. Relative refractory period
f. Absolute refractory period
1. During this stage, the second action potential is inhibited but not impossible should a larger
stimulus be applied.
2. The nerve is stimulated by the minimal threshold level.
3. The electrical potential of the neuron is approximately −70 mV.
4. During this stage, the electrical charge on the outside of the membrane is positive, while the
electrical charge on the inside of the membrane is negative.
5. Occurs once the peak of the action potential is reached and the membrane potential begins to
move back toward the resting potential.
6. The resting potential of the cell changes to become more negative, but not enough to trigger
the firing threshold.
7. The interval during which a second action potential cannot be initiated, no matter how large a
stimulus is applied.
8. The outside of the cell contains excess sodium ions at a ratio of 14:1; the inside of the cell
contains excess potassium ions.
9. The gated Na+
channels on the resting neuron’s membrane release and open suddenly in order
to allow the Na+
in the extracellular fluid to influx into the cell.
10. The impulse moves between the uninsulated nodes of Ranvier that exist between each
Schwann cell.
1. ANS: E DIF: Recall REF: 21| 23 OBJ: 8
TOP: NBDHE, 2.0 Physiology
2. ANS: C DIF: Recall REF: 21 OBJ: 8
TOP: NBDHE, 2.0 Physiology
3. ANS: A DIF: Recall REF: 20 OBJ: 5| 6
TOP: NBDHE, 2.0 Physiology
4. ANS: A DIF: Recall REF: 20 OBJ: 8
TOP: NBDHE, 2.0 Physiology
5. ANS: D DIF: Recall REF: 21 OBJ: 8
TOP: NBDHE, 2.0 Physiology
6. ANS: B DIF: Comprehension REF: 21
OBJ: 8 TOP: NBDHE, 2.0 Physiology
7. ANS: F DIF: Recall REF: 21| 23 OBJ: 7
TOP: NBDHE, 2.0 Physiology
8. ANS: A DIF: Recall REF: 20 OBJ: 8
TOP: NBDHE, 2.0 Physiology