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48 Cards in this Set
- Front
- Back
the efferent pathways of the autonomic nervous system consists of
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sympathetic and parasympathetic
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the central nervous system consists of
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brain and spinal cord
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the peripheral nervous system consists of
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the rest of the body
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a neuron that transmits a nerve impulse towards the central nervous system is called
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sensory neuron
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the largest and most numerous glia
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astrocytes
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what is the function of the central nervous system
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evaluates information, initiates outgoing responses, integrates sensory information
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what do we call the part of the nervous system that transmits impulses from the CNS to skeletal muscle
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somatic nervous system
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what forms the myelin sheath
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schwann cells
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myelin sheath is associated with white fibers in the brain
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true
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myelin sheath is important for nerve impulse conduction
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true
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myelin sheath is destroyed in people with MS
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true
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myelin sheath covers cell bodies in the brain and spinal cord
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false
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neurons in the CNS have less chance of regenerating
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when the microglia form scar tissue
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along a neuron the correct pathway for impulse conduction is
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dendrites, cell body, axons
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what do we call a neuron that has only one axon and several dendrites
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multipolar
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the reflex arc always consists of an afferent and efferent neuron
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true
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multipolar neurons have
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multiple dendrites and one axon
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most unipolar neurons are
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sensory neurons
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fascicles are held together by a connective tissue layer called
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perineurium
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the grey matter in the brain and spinal cord consist primarily of
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myelinated fibers
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regeneration of nerve fibers will take place only if the cell body is in tact and the fibers have
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neurilemma
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which of the following does not cross the blood brain barrier
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dopamine
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which neurotransmitter is associated with parkinsons disease
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dopamine
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dendrites conduct impulses ______ cell bodies
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toward
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a neurons resting membrane potential is
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-70mV
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the larger the diameter of a nerve fiber will
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slow down
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where is the synaptic knob located
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on the axon
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there are how many miles of nerves in the human body
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45
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which is true of a neuron with a resting potential
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sodium pump moves sodium to the outside of the cell membrane
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when we have an action potential the outside of the plasma membrane is
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negatively charged
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when we have an action potential the inside of the plasma membrane is
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positively charged
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the only ions that can diffuse across a neurons membrane when the neuron is at rest is
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potassium
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what is the first event to occur when an adequate stimulus is applied to the neuron
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the 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
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local potential
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during a relative refractory period what can happen to the action potential
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if the stimulus is strong enough an action potential can occur
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what does a synapse consist of
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synaptic knob, synaptic cleft, plasma membrane
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when an impulse reaches a synapse what occurs
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chemical transmitters are released
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excitatory neurotransmitters are most likely to initiate
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action potential
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when a current leaps across an insulating myelin sheath from node to node the type of impulse conduction is
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salutatory conduction
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for a neurotransmitter to produce an inhibitory post synaptic potential which of the following channels must open
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potassium and/or chlorine channels
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what are the main chemical classes of neurotransmitters
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acetylcholine, amines, neuropeptides
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serotonin is an example of what kind of neurotransmitter
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amine
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are all neurotransmitters inhibitory
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no
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what are the most common neurotransmitters in the CNS
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amino acids
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glycine is what kind of neurotransmitter
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amino acid (inhibitory)
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which is not true of the myelin sheath |
it covers cell bodies in the brain and spinal cord |
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interneurons reside in the |
CNS only |
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nerves that contain mostly Afferent fibers are caked |
sensory nerves |