A&P 1 Quiz 11

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Nerve Cell adhesion molecules (N-CAMs) ____.

are crucial for the development of neural connections

Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?


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


Select the correct statement regarding synapses.

The synaptic cleft prevents an impulse from being transmitted directly from one neuron to another.

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

What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called?

ependymal cells

Which of the following describes the nervous system integrative function?

analyzes sensory information, stores information, makes decisions

A second nerve impulse cannot be generated until ________.

the membrane potential has been reestablished

A neuron that has as its primary function the job of connecting other neurons is called a(n) ________.

association neuron

What does the central nervous system use to determine the strength of a stimulus?

frequency of action potentials

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

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

The term central nervous system refers to the ________.

brain and spinal cord

Which of the following describes the excitatory postsynaptic potential?

short distance depolarization

Which of the choices below describes the ANS?

motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands

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

Which of the following is not characteristic of neurons?

They are mitotic

What is the role of acetylcholinesterase?

destroy ACh is a brief period after its release by the axon endings

Salatory conduction is made possible by

the myelin sheath

Immediately after an action potential has peaked, which cellular gates open?


Which of the following is false or incorrect?

A nerve impulse occurs if the excitatory and inhibitory effects are equal.

Bipolar neurons are commonly ___

found in the retina of the eye

The part of a neuron that conducts impulses away from its cell body is called a(n) ________.


The substance released at axon terminals to propagate a nervous impulse is called a(n) ____.


Which of the following is not a function of astrocytes?

provide the defense for the CNS

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