neurons - 44 Neurons and Nervous Systems TEST FILE...

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44 Neurons and Nervous Systems TEST FILE QUESTIONS Fill in the Blank 1. The part of the neuron specialized for receiving impulses is the _______. Answer: dendrite 2. The initial membrane event of an action potential is the flow of _______ ions across the membrane. Answer: sodium 3. Following an action potential, a neuron has a _______ during which it cannot be stimulated. Answer: refractory period 4. In myelinated axons of vertebrate neurons, breaks in the insulation occur at points called the _______. Answer: nodes of Ranvier 5. Deadly nerve gases inhibit the enzyme _______. Answer: acetylcholinesterase 6. In vertebrates, the two most common inhibitory neurotransmitters are _______ and _______. Answer: GABA; glycine 7. The information that flows through the nervous system consists of chemical and _______ messages. Answer: electrical 8. When a neuron contacts another neuron, a muscle, or a gland, special junctions called _______ transmit the message carried by the incoming neuron. Answer: synapses 9. Special glial cells, called _______, surround the smallest, most permeable blood vessels in the brain, thereby par ticipating in the formation of the blood–brain barrier. Answer: astrocytes 10. The nicotinic receptors of acetylcholine are not metabotropic receptors but rather _______ receptors. Answer: ionotropic
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11. The depolarization of a neuron must rise above the _______ before an action potential is achieved. Answer: threshold 12. In simple organisms such as the sea anemone, the nervous system consists of a _______. Answer: nerve net 13. Neurotransmitters that depolarize the postsynaptic membrane bring about an _______ postsynaptic potential. Answer: excitatory 14. Two gases, nitric oxide and _______, are used as intercellular messengers by neurons. Answer: carbon monoxide 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.
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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.
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This note was uploaded on 11/29/2011 for the course BIOLOGY BIO 187 taught by Professor Capco during the Spring '11 term at ASU.

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neurons - 44 Neurons and Nervous Systems TEST FILE...

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