Download Chapter 7 Nervous System Neuron Worksheet

Chapter 7 Nervous System, Neuron Worksheet
1) The term central nervous system refers to the:
Page Ref: 223
2) Ciliated CNS neuroglia that line the cavities of the brain and spinal cord, and play an active role in moving
the cerebrospinal fluid, are:
Page Ref: 225
3) Part of a Schwann cell (mostly cytoplasm) that is external to the myelin sheath and forms a "neuron husk":
Page Ref: 226
4) NOT a structural feature of a neuron, but plays a critical role as a functional junction between neurons:
Page Ref: 226; 233
5) The neuron processes that normally receive incoming stimuli are called:
Page Ref: 226
6) Small collections of nerve cell bodies found in a small number of locations outside the central nervous
system are called:
Page Ref: 228
7) What is myelin:
Page Ref: 226
8) Sensory receptor sensitive to deep pressure:
Page Ref: 230
9) A neuron with a cell body located in the CNS whose primary function is connecting other neurons is called
a(n):
Page Ref: 229
10) A myelinated nerve fiber is characterized as being ________, whereas an unmyelinated nerve fiber is
characterized as being ________.
Page Ref: 228
11) Impulse conduction is fastest in neurons that are:
Page Ref: 226
12) Bipolar neurons are commonly:
Page Ref: 230
13) An action potential:
Page Ref: 231
14) Immediately after an action potential is propagated, which ions rapidly diffuses out of the cell into the tissue
fluid
Page Ref: 231-232
15) How, does the interior surface of a cell membrane of a polarized neuron, differs from the external
environment? The interior is:
Page Ref: 231-232
16) How, does the interior surface of a cell membrane of a depolarized neuron, differs from the external environment? The
interior is:
Page Ref: 231-232
17) When a nerve fiber is polarized, the concentration of sodium ions?
Page Ref: 231-232
18) Correct sequence of events that follows a threshold potential:
1. the membrane becomes depolarized
2. sodium channels open and sodium ions diffuse inward
3. the membrane becomes repolarized
4. potassium channels open and potassium ions diffuse outward while sodium is actively transported out of the cell
Page Ref: 232
19) Saltatory conduction:
Page Ref: 232
20) The point at which an impulse from one nerve cell is communicated to another nerve cell is the:
Page Ref: 226; 233
21) The substance that is released at axonal endings to propagate a nervous impulse is called:
Page Ref: 226; 233
22) Correct sequence in a typical reflex arc:
Page Ref: 223; 234
23) Muscles and glands are effectors or receptors?
Page Ref: 224; 23
True or False
24) Myelination of nerve fibers in the central nervous system is the job of the oligodendrocyte.
Page Ref: 225-226
25) If bacteria were to invade the CNS tissue, microglia would migrate to the area to engulf and destroy them.
Page Ref: 225
26) The nodes of Ranvier are found at regular intervals only on myelinated, peripheral nerve fibers.
Page Ref: 226-227
27) Cell bodies of sensory neurons are always located in ganglia lying outside the central nervous system.
Page Ref: 228
28) An afferent sensory neuron carries stimuli from the central nervous system to the effector.
Page Ref: 228-229
29) Efferent nerve fibers may be described as motor nerve fibers.
Page Ref: 229
30) During depolarization, the inside of the neuron's membrane becomes less negative (more positive).
Page Ref: 231-232
31) The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for
conduction to take place.
Page Ref: 231
32) Reflexes are rapid, predictable, and automatic responses to stimuli.
Page Ref: 234
33) Saltatory conduction occurs due to the presence of salt (NaCl) around the neuron.
Page Ref: 226; 232