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BIOS 2310 Unit 4 Nervous System Review
Name_________________
__C__1. The brain and the spinal cord are the
a. peripheral nervous system
c. central nervous system
b. sympathetic nervous system
d. parasympathetic nervous system
__C__2. What is the basic functional unit of the nervous system?
a. cell body
b. reflex arc
c. neuron
d. neutron
__A__3. Which of the following is true about a motor neuron?
a. Dendrites carry information toward the cell body.
b. Dendrites carry information away from the cell body.
c. Axons carry information toward the cell body.
d. None of the above
__C__4. Neurons that have repolarized will have a high concentration of which one of these
outside the axon?
a. sodium ions
b. negatively charged ions c. potassium ions
d. hydrogen ions
__A__5. Which neurons conduct information toward the central nervous system?
a. sensory neurons
b. motor neurons
c. interneurons
d. none of the above
__A__6. Neurons with myelin sheath conduct nerve impulses
a. faster than neurons without myelin sheaths.
b. slower than neurons without myelin sheaths.
c. at the same speed as neurons without myelin sheaths.
d. in greater numbers than neurons without myelin sheaths.
__D__7. Gray matter is best described as
a. having less cell bodies than white matter b. working faster than white matter
c. having a high fat content
d. having more cell bodies than white matter
__C__8. What are the spaces between adjacent neurons called?
a. reflex arc
b. effector
c. synapse
d. resting potential
__B__9. What is the function of neurotransmitters?
a. builds new neurons
b. chemically link neurons across the synapse to conduct impulses
c. push sodium ions across the plasma membrane
d. increases the speed of the impulse along the axon
__B__10. The minimum level of a stimulus that is required to activate a neuron is
called the
a. action potential
b. threshold
c. resting potential
d. polarization
__A__11. The long fiber that carries impulses away from the nerve cell body is a (n)
a. axon
b. interneuron
c. dendrite
d. axon terminal
__B__12. Which description does not apply to nerve impulses?
a. They follow an all-or-none principle.
c. They travel from neuron to neuron.
b. They flow at various speeds.
d. They flow in only one direction.
__C__13. The somatic nervous system regulates activities that are
a. unconscious control
b. involuntary
c. conscious control
d. automatic
__D__14. The autonomic nervous system
a. contains both voluntary and involuntary nerve impulses
b. operates under conscious control
c. is controlled by the endocrine system
d. operates under unconscious control
Match the brain structure to its description. Some answers will be used more than once.
__C___15. Controls heart rate, blood pressure, breathing rate.
A. Pons
__B___16. Conscious part of the brain.
B. Cerebrum
__D___17. Coordinates skeletal muscle contractions.
C. Medulla
__A___18. Located directly above the medulla.
D. Cerebellum
___B__19. Contains cells for memory.
___C__20. Connects directly to the spinal cord.