Question :
11. Eycine operated the telephone switchboard at a large company, answering : 1201904
11. Eycine operated the telephone switchboard at a large company, answering calls and directing them to the appropriate extensions. Remembering her introductory psychology class, she decided that her situation was much like that of the _____ of neurons, because numerous people could call her at one time, but she could send out only one call at a time.
A. hormones and target organs
B. dendrites and axons
C. myelin and mitochondria
D. synapses and neurotransmitters
12. Mimi is sitting in her biology lab, trying to figure out what kind of a cell she has on the slide under her microscope. “Aha,” she cries. “It’s a neuron!” One thing that might have tipped Mimi off is the fact that the cell has
A. an outer membrane.
B. an axon.
C. mitochondria.
D. sulci.
13. Dr. Gedge is examining a cell under a microscope. He sees a long, fibrous strand of tissue extending from one end of the cell body. He immediately recognizes this as a(n) _____, which is responsible for _____.
A. axon; carrying signals away from the cell body
B. axon; receiving signals from other cells and carrying them toward the cell body
C. dendrite; carrying signals away from the cell body
D. dendrite; receiving signals from other cells and carrying them toward the cell body
14. What is the usual route of information flow between neurons?
A. Dendrite (neuron 1) to axon (neuron 2) to cell body (neuron 2)
B. Axon (neuron 1) to dendrite (neuron 2) to cell body (neuron 2)
C. Axon (neuron 1) to cell body (neuron 2) to dendrite (neuron 2)
D. Cell body (neuron 1) to axon (neuron 2) to dendrite (neuron 2)
15. As a signal travels from one neuron to another, it is received by the _____ and carried to the cell body; from here, the signal is carried through the _____.
A. dendrites; axon
B. neurotransmitter; synapse
C. axon; dendrites
D. synapse; neurotransmitter
16. The fastest action potentials, which travel at speeds of 260 miles per hour, are most likely to occur in axons that
A. are wrapped in myelin.
B. fire continuously without rest.
C. are small in diameter.
D. lack vesicles.
17. The speed with which a message travels from point A to point B along a neuron depends on all of the following factors except
A. the.distance between the two points.
B. the diameter of the axon.
C. a fatty substance surrounding the axon.
D. the intensity of the stimulus that initiated it.
18. Multiple sclerosis is a disease in which the immune system mistakenly destroys some of the myelin wrapped around nerve cell fibers. Which nerve cell fibers are being attacked by this process?
A. Synapses
B. Axons
C. Dendrites
D. Mitochondria
19. Nick the neuron is bragging to his friend Nell the neuron because he is able to send messages faster than Nell. Nick’s axon is most likely
A. small and myelinated.
B. small and unmyelinated.
C. large and myelinated.
D. large and unmyelinated.
20. The refractory period of a neuron is the
A. time necessary for transmission across the synapse.
B. time necessary for a message to travel from the cell body to the end of the axon.
C. resting period between firings.
D. length of time a neuron can fire continuously.
