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A neuron's nucleus is located in its _____. (Activity 48A)
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| cell body |
| axon |
| myelin sheath |
| dendrite |
| synaptic terminals |
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A nerve impulse moves toward a neuron's cell body along _____. (Activity 48A)
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| dendrites |
| synaptic terminals |
| oligodendrocytes |
| axons |
| nodes of Ranvier |
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A nerve impulse moves away from a neuron's cell body along _____. (Activity 48A)
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| dendrites |
| Nissl bodies |
| synapses |
| axons |
| glia |
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An impulse relayed along a myelinated axon "jumps" from _____ to _____. (Activity 48A)
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| oligodendrocyte ... Schwann cell |
| node of Ranvier ... Schwann cell |
| node of Ranvier ... node of Ranvier |
| Schwann cell ... Schwann cell |
| Schwann cell ... node of Ranvier |
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Axons insulated by a(n) _____ are able to conduct impulses faster that those not so insulated. (Activity 48A)
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| node of Ranvier |
| synaptic terminal |
| myelin sheath |
| layer of asbestos |
| astrocytes |
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What type of cell makes up the myelin sheath of a motor neuron? (Activity 48A)
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| astrocytes |
| microglial cells |
| Ranvier cells |
| ependymal cells |
| Schwann cells |
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What part of a neuron relays signals from one neuron to another neuron or to an effector? (Activity 48A)
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| dendrite |
| axon hillock |
| synaptic terminal |
| axon |
| node of Ranvier |
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A neuron has a resting potential of about _____ millivolts. (Activity 48B)
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| +50 |
| +35 |
| –55 |
| –70 |
| –80 |
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An action potential moves along a(n) _____. (Activity 48B)
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| myelin sheath |
| axon |
| dendrite |
| synapse |
| cell body |
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At rest, which of these plays a role in establishing the charge differential across a neuron's plasma membrane? (Activity 48B)
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| the sodium-potassium pump moving sodium ions into the neuron and potassium ions out of the neuron |
| the diffusion of sodium ions out of the neuron |
| the diffusion of potassium ions into the neuron |
| the sodium-potassium pump moving sodium ions out of the neuron and potassium ions into the neuron |
| the diffusion of sodium ions into the neuron |
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The transmission of a nerve impulse first triggers the _____. (Activity 48B)
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| action of the sodium-potassium pump |
| opening of voltage-gated sodium channels and the diffusion of sodium ions into the neuron |
| opening of voltage-gated sodium channels and the diffusion of sodium ions out of the neuron |
| opening of voltage-gated potassium channels and the diffusion of potassium ions out of the neuron |
| opening of voltage-gated potassium channels and the diffusion of potassium ions into the neuron |
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A
stimulus has opened the voltage-gated sodium channels in an area of a neuron's
plasma membrane. As a result, _____ rushes into the neuron and diffuses to
adjacent areas; this in turn results in the _____ in the adjacent areas.
(Activity 48B)
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| potassium ... opening of voltage-gated potassium channels |
| sodium ... opening of voltage-gated potassium channels |
| sodium ... opening of voltage-gated sodium channels |
| sodium ... closing of voltage-gated sodium channels |
| potassium ... opening of voltage-gated sodium channels |
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Which of these causes the release of neurotransmitter molecules? (Activity 48C)
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| the receipt of a signal from the postsynaptic neuron |
| the opening of voltage-regulated calcium channels and the diffusion of calcium ions out of the neuron |
| an action potential reaching the end of the cell body |
| an action potential reaching the end of the axon |
| an action potential reaching the end of the dendrite |
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The space between an axon of one neuron and the dendrite of another neuron is called a(n) _____. (Activity 48C)
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| synaptic cleft |
| node of Ranvier |
| internodes |
| synapse |
| synaptic terminal |
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Neurons store neurotransmitter molecules in vesicles located within _____. (Activity 48C)
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| the cell body |
| myelin |
| the synaptic cleft |
| dendrites |
| synaptic terminals |
