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Nerve Cell adhesion molecules (N-CAMs) ____. |
are crucial for the development of neural connections |
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Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle? |
acetylcholine |
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An inhibitory postsynaptic potential (IPSP) is associated with ____. |
hyperpolarization |
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Select the correct statement regarding synapses. |
The synaptic cleft prevents an impulse from being transmitted directly from one neuron to another. |
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If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon ________. |
the impulses would spread bidirectionally |
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What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called? |
ependymal cells |
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Which of the following describes the nervous system integrative function? |
analyzes sensory information, stores information, makes decisions |
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A second nerve impulse cannot be generated until ________. |
the membrane potential has been reestablished |
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A neuron that has as its primary function the job of connecting other neurons is called a(n) ________. |
association neuron |
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What does the central nervous system use to determine the strength of a stimulus? |
frequency of action potentials |
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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 |
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Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials? |
voltage-gated channel |
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The term central nervous system refers to the ________. |
brain and spinal cord |
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Which of the following describes the excitatory postsynaptic potential? |
short distance depolarization |
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Which of the choices below describes the ANS? |
motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands |
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Which of the following is true about the movement of ions across excitable living membranes? |
Sodium gates in the membrane can open in response to electrical potential changes |
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Which of the following is not characteristic of neurons? |
They are mitotic |
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What is the role of acetylcholinesterase? |
destroy ACh is a brief period after its release by the axon endings |
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Salatory conduction is made possible by |
the myelin sheath |
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Immediately after an action potential has peaked, which cellular gates open? |
potassium |
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Which of the following is false or incorrect? |
A nerve impulse occurs if the excitatory and inhibitory effects are equal. |
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Bipolar neurons are commonly ___ |
found in the retina of the eye |
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The part of a neuron that conducts impulses away from its cell body is called a(n) ________. |
axon |
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The substance released at axon terminals to propagate a nervous impulse is called a(n) ____. |
neurotransmitter |
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Which of the following is not a function of astrocytes? |
provide the defense for the CNS |
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