Ch44MCAT

Ch44MCAT - 44 Neurons and Nervous Systems Multiple Choice...

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44 Neurons and Nervous Systems Multiple Choice 1. Neurons that transmit information from sensory cells to the central nervous system are part of the a. brain. b. peripheral nervous system. c. central nervous system. d. spinal cord. e. nerve net. Answer: b 2. The functions of glial cells include all of the following except a. supporting developing neurons. b. supplying nutrients. c. conducting nerve impulses. d. consuming foreign particles. e. insulating nerve tissue. Answer: c 3. About how many neurons are there in the human brain? a. 100 thousand b. 1 million c. 100 million d. 1 billion e. 100 billion Answer: e 4. Electrical synapses a. do not integrate information well. b. are also called gap junctions. c. cannot be inhibitory. d. are a fast means of signal transmission. e. All of the above Answer: e 5. Which of the following describes the resting potential of the neuronal cell membrane? a. The inside is 60 millivolts more positive than the outside. b. The outside is 60 millivolts more positive than the inside. c. The inside is 30 millivolts more positive than the outside. d. The outside is 30 millivolts more positive than the inside. e. The inside has about the same charge as the outside. Answer: b
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6. Which of the following can carry electric charges across the cell membrane? a. Electrons b. Protons c. Water d. Ions e. Proteins Answer: d 7. What generally maintains the electric charge across the neuronal membrane? a. Sodium–potassium pump b. Action potential c. Resting potential d. Voltage-gated channels e. Negative ion pump Answer: a 8. Which of the following describes the mechanism of voltage-gated channel proteins? a. If the membrane voltage reaches threshold potential, ions are pumped through. b. If the membrane voltage reaches threshold potential, ions can diffuse through. c. Ions can move through only if the overall membrane voltage stays the same. d. Ions are pumped through in order to maintain existing membrane voltage. e. When the gates close, membrane voltage changes. Answer: b 9. What happens if Na + channels open and sodium ions diffuse into the cell? a. The cell will become hyperpolarized.
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Ch44MCAT - 44 Neurons and Nervous Systems Multiple Choice...

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