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