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36 Cards in this Set
- Front
- Back
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When talking about the myelin sheath, is it associated with the white fibers of the brain? |
Yes |
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Does the myelin sheath cover cell bodies in the brain and spinal cord? |
No |
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What do we call a neuron that has only one axon and several dendrites? |
Multipolar |
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Grey matter consists of mainly? |
Cell bodies |
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The white matter of the nervous system is made up of? |
Myelinated fibers |
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Regeneration of nerve fibers will take place only if the cell body is intact and the fibers have? |
Neurliemma |
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Which neuron transmitter is associated with Parkinsons disease? |
Decrease in dopamine |
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Dendrites conduct impulses in which direction of cell bodies? |
Towards ( afferent) |
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That largest and most abundant type of glia? |
Astrocytes |
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The larger the diameter of a nerve fiber will? |
Slow the speed? |
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How many miles of nerves in the body? |
45 |
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Which is true with a resting potential? A.Sodium inside the cell?B. Sodium outside the plasma membrane |
B. Sodium outside the plasma membrane |
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The only ions that can diffuse across a neurons membrane when the neuron is at rest is? |
Potassium |
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What is the first event to occur when the adequate stimulus is applied to the neuron? |
Sodium channels open up |
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A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called? |
Local potential |
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Which of the following is classified as a nerve fiber? A. Axon B. Dendrites. C. Both |
C. Both |
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Which of the following conducts impulses toward the cell body? A. Axons.B. Dendrites C. Niseel bodies |
Dendrites |
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A neuron with one axon and several dendrites is a? |
Multipolar neuron |
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Which type of neuron lies entirely within the CNS? |
Interneruron |
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What sequence represents the course of an impulse over a reflex are? |
Receptor Sensory neuron Interneuron Motor neuron Effector |
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A complete nerve consisting of a numerous fascicles and their blood supply is held together by a fibrous coat called the? |
Epineurium |
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Small distinct regions of gray matter within the CNS are usually called? |
Nuclei |
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Nerves that contain mostly effernt fibers are called? |
Motor neurons |
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Gray matter in the CBS consists of |
Cell bodies |
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Most nerves in the human system are? |
Mixed nerves |
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Compared with the inside of the cell the outside of the cell membranes is? |
Positive |
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The difference in electrical charge across a plasma membrane is called? |
Membrane potential |
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A neurons resting membrane is? |
-70mV |
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How does the sodium potassium pump work? |
3 Na out for every 2 K in |
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During a relative refractory period? |
An action potential is possible only in response to a very strong stimuli |
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Voltage channels are? |
Ion channels that open in response to voltage fluctuations |
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When current leaps across an insulating myelin sheath from node of Ranveir to node of Raniver, the type of impulse conduction? |
Saltatory conduction |
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The larger the diameter of a nerve fiber? |
The faster the speed of conduction |
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Which of the following structures is not a main component of a chemical synapse? |
Synaptic process |
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A synaptic knob is located on the? |
Axon |
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What is true of spatial summation? |
Neurotransmitters released simultaneously from several presynaptic knobs coverage on one postsynaptic neuron |
