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1. What is the function of the nervous system?
A
Integrating and coordinating body activities
B
Serving as the body's defense mechanisms
C
Moving the body and maintaining posture
2. Which of the following is NOT included in the central nervous system?
A
brain
B
spinal cord
C
spinal nerves
3. Which of the following is NOT true about neuroglial cells?
A
they outnumber neurons 10 to 1
B
they are excitable cells that generate and transmit messages
C
they provide structural support, growth factors, and insulating sheaths around axons
4. Which neurons are also known as afferent neurons?
A
sensory neurons
B
motor neurons
C
interneurons
5. Which neurons are also known as efferent neurons?
A
sensory neurons
B
motor neurons
C
interneurons
6. Which neurons account for more than 99% of the body's neurons?
A
sensory neurons
B
motor neurons
C
interneurons
7. Which neurons carry information away from the CNS to a muscle or gland?
A
sensory neurons
B
motor neurons
C
interneurons
8. Which part of the neuron receives signals from other cells?
A
dendrites
B
axon
C
cell body
9. Which part of the neuron carries information to another neuron or to a muscle or gland?
A
dendrites
B
axon
C
cell body
10. Which part of the neuron contains the nucleus and other organelles?
A
dendrites
B
axon
C
cell body
11. Which of the following is NOT true about the myelin sheath?
A
found on the axons of most neurons in the PNS
B
formed by Schwann cells in the PNS
C
messages jump from one Schwann cell to the next, skipping over nodes of Ranvier
12. Which of the following is NOT true about the sodium-potassium pump?
A
actively transports sodium and potassium ions
B
transport through the sodium-potassium pump does not require energy
C
maintains the -70mV resting potential
13. What happens when sodium gates open and sodium ions enter the neuron?
A
depolarization
B
repolarization
C
resting
14. What happens when potassium gates open and potassium ions leave the cell?
A
repolarization
B
depolarization
C
resting
15. Which neurotransmitter stimulates muscle contraction?
A
acetylcholine
B
serotonin
C
dopamine