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A neuron’s nucleus is located in its _____. |
cell body ( The cell body is the region of a neuron where the nucleus is found.) |
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A nerve impulse moves toward a neuron’s cell body along _____. |
dendrites ( Dendrites conduct an impulse from a synapse toward the cell body.) |
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A nerve impulse moves away from a neuron’s cell body along _____. |
axons |
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An impulse relayed along a myelinated axon "jumps" from _____ to _____. |
node of Ranvier … node of Ranvier |
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Axons insulated by a(n) _____ are able to conduct impulses faster that those not so insulated. |
myelin sheath |
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What type of cell makes up the myelin sheath of a motor neuron? |
Schwann cells |
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What part of a neuron relays signals from one neuron to another neuron or to an effector? |
synaptic terminal |
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A neuron has a resting potential of about _____ millivolts. |
-70 |
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An action potential moves along a(n) _____. |
axon |
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At rest, which of these plays a role in establishing the charge differential across a neuron’s plasma membrane? |
the sodium-potassium pump moving sodium ions out of the neuron and potassium ions into the neuron |
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The transmission of a nerve impulse first triggers the _____. |
opening of voltage-gated sodium channels and the diffusion of sodium 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. |
sodium … opening of voltage-gated sodium channels |
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Which of these causes the release of neurotransmitter molecules? |
an action potential reaching the end of the axon |
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The space between an axon of one neuron and the dendrite of another neuron is called a(n) _____. |
synaptic cleft "Synaptic cleft" is the name given to the space between two neurons that meet at a synapse. |
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Neurons store neurotransmitter molecules in vesicles located within _____. |
synaptic terminals |
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