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Chapter 31 Vocabulary Review
For Questions 1–10, match the term with its description.
1. peripheral nervous system
A. Short, branched extensions from the
neuron’s cell body that carry impulses
from other neurons to the cell body
2. myelin sheath
3. threshold
B. Insulating membrane surrounding the
axon of a neuron
4. dendrites
5. neurotransmitter
C. Pathway travelled by impulses during a
rapid response
6. somatic nervous system
D. Regulates activities under conscious
7. reflex arc
8. cochlea
E. The minimum level of a stimulus that is
required to cause an impulse in a neuron
9. cornea
10. reflex
F. Nerves and supporting cells that collect
information about the body’s
G. Chemical that transmits an impulse
across a synapse to another cell
H. Tough, transparent layer of cells
through which light enters the eye
I. Fluid-filled inner ear structure lined
with hair cells
J. Quick, automatic response to a stimulus
For Questions 11–20, complete each statement by writing the correct word or words.
11. The
the cerebrum.
receives messages from sensory receptors and relays information to
12. The division of the peripheral nervous system that regulates involuntary activities is the
13. The
is the site of intelligence, learning, and judgment in the brain.
14. The lens focuses light onto the
15. The
, the inner layer of the eye.
has three regions, the midbrain, the
, and the medulla
16. Photoreceptors that do not distinguish different colors are
17. The brain and the spinal cord make up the
18. The
is made up of densely packed nerve cell bodies called gray
19. Most addictive substances act on synapses that use
20. A nerve impulse, or
another neuron or the environment.
as a neurotransmitter.
, begins when a neuron is stimulated by