Neurophysiology

Which statement is true of local anesthesia?

• Local anesthesia is an unpleasant sensory and emotional experience

• Local anesthesia eliminates the feeling of sensation through loss of consciousness

• Local anesthesia is never needed for dental hygiene appointments

• Local anesthesia eliminates the feeling of sensation without the loss of consciousness

Which is the most popular anesthetic used in the USA?

• Articaine

• Lidocaine

• Novcaine

• Mepivacaine

When a neuron is depolarized, what are the first channels to open?

• Sodium
• Potassium
• Calcium
• ACTH

Within a nerve fasicle, which bundles fully recover from anesthetics first?

• Mantle bundles

• Nodes of Ranvier

• Core bundles

• Schwann cells

Which fibers are responsible for the transmission of sharp dental pain?

• A beta

• C fibers

• A gamma

• A delta

Saltatory conduction refers to:

• Diffusion of sodium chloride into the nerve cell during impulse conduction

• Rapid transmission of nerve impulses along a myelinated nerve fiber

• Conduction of an impulse along a nonmyelinated nerve at the nodes of Ranvier

• The movement of continuous waves along a nerve fiber

In a resting neuron, what positive ion is most abundant inside the cell membrane?

• Potassium

• Sodium

• Calcium

• Hydrogen

The electrical potential of nerve axoplasm in the resting state is approximately

• 0

• +70

• -70

• +40

Tags

NGSS.HS-PS3-5

How many K+ ions are pumped back into the cell during one cycle by the NA/K pump?

• 2

• 3

• 4

• 1