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CBNS 106 Study Guide - Final Guide: Grey Matter, Subarachnoid Space, Somatic Nervous System

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savvysmiles
26 Oct 2021
School
UC Riverside
Department
Cell Biology and Neuroscience
Course
CBNS 106
Professor
Fiacco Todd

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Document Summary

A collection of neuron cell bodies in the brain is a nucleus: true, false, which of the following is not a function of glial cells, maintaining a neuron"s chemical environment, sending action potentials to effector tissues. Insulating axons: devouring microorganisms, transferring nutrients to neurons. Which of the following would be the most likely value of its membrane potential: +30 mv, 0 mv. Increase: decrease, stay the same, extracellular potassium levels are ____________________ intracellular potassium levels, greater than, less than, the same as, the influx of chloride ions (cl-) will cause the membrane potential of a neuron to: Increase: decrease, stay the same, as a graded potential moves away from its site of origin, its amplitude will: Increase: decrease, stay the same, as an action potential moves away from its site of origin, its amplitude will: Increase: decrease, stay the same, voltage-gated channels are primarily found on the, axon, dendrites, soma. Refer to the above graph for the next 5 questions.

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Related Questions

1.A stronger stimulus to a neuron results in ________.

A. larger voltage changes in graded potentials and greater frequency of action potentials produced in response

B. greater frequency of graded potentials and larger voltage changes in the action potentials produced in response

C. larger voltage changes in the graded potentials, but no changes in action potentials

D. larger voltage changes in both graded and action potentials

E. larger voltage changes in graded potentials but smaller action potentials

2. Why is it more difficult to fire an action potential when the interval between stimuli decreases?

A. because sodium is flowing out of the cell

B. because potassium is flowing into the cell

C. because some sodium channels may still be in an inactivated state

D. because chloride is flowing into the cell

E. because chloride is flowing out of the cell

3. As an action potential zips down an axon,

A. voltage gated potassium channels open first followed by voltage-dependent sodium channels

B. voltage- gated sodium channels ahead of the wave and not yet activated are influenced by the depolarizing electrical field of other nearby sodium channels

C. voltage-gated potassium channels ahead of the wave and not yet activated are influenced by the depolarizing electrical field of nearby sodium channels

D. leak channels are opened by the wave of electricity passing along the axon

E. B and C

The following involves Ions during action potentials.

A. True or false: After an action potential the concentration gradient of sodium is significantly reduced

B. If the membrane potential is depolarized to -10mV which direction will potassium ions flow through voltage gated potassium channels?
a. Into the neuron
b. Out of the neuron
c. No net movement
d. Cannot be determined from the information given

If the opening of Na+ channels is responsible for depolarizing a neuron (making membrane more positive) to produce an action potential, and a depolarized membrane potential is what keeps Na+ channels open, how does the neuron ever repolarize its membrane (make membrane more negative again)?