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Skills Worksheet
Concept Mapping
Using the terms and phrases provided below, complete the concept map showing
the structures of the nervous system.
central nervous system
parasympathetic division
spinal cord
interneurons
peripheral nervous system
sympathetic division
motor neurons
somatic nervous system
synapses
neurons
Nervous system
consists of
is divided into
1.
which communicate
across
2.
3.
which is divided into
which consists of
which includes
4.
5.
brain
6.
autonomic
nervous system
using signal
molecules called
nerves
which contains
neurotransmitters
7.
which contain
which
link
sensory neurons
to
8.
which is divided into
9.
10.
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Holt Biology
25
Nervous System
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TEACHER RESOURCE PAGE
2. Reaction times increase and coordina-
and temperature, are carried by
A fibers. Motor impulses to skeletal
muscles are also carried by A fibers.
These types of impulses relay information about the external surroundings
and how the body will respond to
external stimuli. The speed with which
these impulses are carried could
reduce the incidence of injury to the
body by allowing for a quick reaction
to a stimulus.
3. Student answers will vary. Sample
answer: Two factors that influence the
speed with which an impulse is conducted are the diameter of the axon
and whether or not it is myelinated. In
the absence of myelination, increasing
the diameter of the axon will increase
the speed of impulse conduction. The
large axons in the organisms are
responsible for the escape or withdrawl reflexes.
tion, judgment, and speech become
impaired.
3. Alcohol is absorbed into the blood
through the stomach and small
intestine.
4. a
Vocabulary Review
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
d
f
b
e
a
c
i
g
h
motor neuron
cerebrum
central nervous system
thalamus
spinal cord
peripheral nervous system
sensory neuron
brain
hypothalamus
interneurons
brain stem
cerebellum
reflex
f
a
c
g
d
b
e
tolerance
depressant
stimulant
psychoactive drugs
withdrawal
addiction
INTERPRETING SCIENTIFIC
ILLUSTRATIONS
4.
5.
6.
7.
8.
9.
axon terminal
neurotransmitter molecule
drug molecule
reuptake receptor
receptor protein
The drug molecule binds to the reuptake receptor that would normally
remove the neurotransmitter molecules
from the synapse and end the impulse.
As a result, the impulse continues
and the postsynaptic neuron is overstimulated.
Concept Mapping
1.
2.
3.
4.
5.
6.
7.
8.
9.
neurons
central nervous system
peripheral nervous system
synapses
somatic nervous system
spinal cord
interneurons
motor neurons
sympathetic division or
parasympathetic division
10. sympathetic division or
parasympathetic division
Science Skills
INTERPRETING DATA
1. The larger the diameter of the axon,
the faster it conducts impulses.
2. Student answers will vary but may
include the idea that sensory impulses
from the skin, such as touch, pressure,
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Holt Biology
81
Nervous System