Chapter 11

The part of a neuron that conducts impulses away from its cell body is called a/an ________.

axon

The term central nervous system refers to the ________

brain and spinal cord

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

ependymal cells

Bipolar neurons are commonly ________.

found in the retina of the eye

Collections of nerve cell bodies outside the central nervous system are called ________.

ganglia

Which of the following is not a function of the autonomic nervous system?

innervation of skeletal muscle

Which of the choices below best describes the ANS?

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

Saltatory conduction is made possible by ________.

myelin sheath

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

The substance released at axon terminals to propagate a nervous impulse is called a/an________.

neurotransmitter

Schwann cells are functionally similar to ________

oligodendrocytes

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

potassium

Which of the following is not a function of astrocytes?

provide the defense for the CNS

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

An impulse from one nerve cell is communicated to another nerve cell via the ________.

synapse

What is the role of acetylcholinesterase

termination of skeletal muscle impulse

A second nerve impulse cannot be generated until ________.

the membrane potential has been reestablished

Which of the following is not characteristic of neurons?

they are mitotic

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

Which of the following will occur when an excitatory postsynaptic potential (EPSP) is being generated on the dendritic membrane?

a single type of channel will open, permitting simultaneous flow of sodium and potassium

The period after an initial stimulus when a neuron is not sensitive to another stimulus is the ________.

absolute refractory period

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

acetylcholine

Which of the following describes the nervous system integrative function?

analyzes sensory information, stores information, makes decisions

A neuron that has as its primary function the job of connecting other neurons is called a/an

association neuron

Neuroglia that control the chemical environment around neurons by buffering potassium and recapturing neurotransmitters are ________.

astrocytes