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A&P Chapter 12 The Central Nervous System

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11.

Which of the following is not a function of astrocytes?

provide the defense for the CNS

12.

The nodes of Ranvier are found only on myelinated, peripheral neuron processes.

False

13.

Which result of the stimulus applied is the likely cause of the response observed in the left graph?

opening of gated Na+ channels

14.

What major ion currents occur at the point along the action potential phase labeled D?

diffusion of K+ out of the axon through gated ion channels

15.

A second nerve impulse cannot be generated until ________.

the membrane potential has been reestablished

16.

In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? The interior is ________.

negatively charged and contains less sodium

17.

Strong stimuli cause the amplitude of action potentials generated to increase.

False

18.

What event is depicted in the structure labeled A?

movement of Ca2+ into the interior of the axonal terminus through voltage-gated channels

19.

Opening K+ or Cl- channels in a postsynaptic membrane would produce an inhibitory postsynaptic potential (IPSP).

True

20.

An inhibitory postsynaptic potential (IPSP) is associated with ________.

hyperpolarization