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Exam 2: Neurophysiology

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Question 1

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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. -The resting potential of the cell changes to become more negative,but not enough to trigger the firing threshold.

A) Polarization
B) Slow depolarization
C) Rapid depolarization
D) Repolarization
E) Relative refractory period
F) Absolute refractory period

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Question 2

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As the action potential moves down the line,its strength decreases as it moves from one neuron to the next.The action potential in myelinated axons does not propagate as waves as in unmyelinated axons.

A) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second statement is false.
D) The first statement is false; the second statement is true.

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Question 3

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The nerve cell stage in which potassium returns to the inside of the cell and sodium returns to the outside of the cell is called what?

What are the nerves that conduct signals from sensory neurons to the spinal cord or brain called?

The cell body of which neuron participates in impulse conduction and therefore is located at the terminal arborization?

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. -During this stage,the second action potential is inhibited but not impossible should a larger stimulus be applied.

What is another name for axons?

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. -The outside of the cell contains excess sodium ions at a ratio of 14:1; the inside of the cell contains excess potassium ions.

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. -The impulse moves between the uninsulated nodes of Ranvier that exist between each Schwann cell.

What do local anesthetic drugs inhibit in order to prevent nerve cell stimulation?

Tasks for neurons include receiving,processing,and sending information.They communicate with other neurons through axons and synapses.

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. -Occurs once the peak of the action potential is reached and the membrane potential begins to move back toward the resting potential.

The lipoprotein sheath that surrounds many neurons is called ______ and is composed of ______.

Nerve fiber type _____ ,the smallest and the most numerous nerve fiber,is responsible for what type of pain?

What is the layer of connective tissue that surrounds the entire nerve called?

What is the most distal arborization of the nerve endings called?

Which description best describes the mechanism by which local anesthetic drugs work?

At the synaptic knobs of neuron cells,what type of action is required to have the electrical impulse cross the synapse of one cell to another cell?

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. -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.

Why do the IA and PSA require more anesthetic than an infiltration of local anesthetic?