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Kaylee's final review questions
36 cards·by kayleeallen27
what is necesssary for neuron repair
the perikaryon must be in tact and if the dendrite or axon is myelinated
what is voltage
the result of seperation of oppositely charged particles
what is the barrier called which keeps ions apart in a nerve impulse
the plasma membrane
what does polarization mean
a difference in charge between the outside of the plasma membrane and the inside of the cell
what is polarization due to
an excess of negative ions inside
while repolarization is taking place what cannot happen
another action potential cannot be generated this is calld the refracting period
what is saltatory conduction
in myelinated neurons impulses jump from node to node
what type of impulse requires less energy and is more rapid
saltatory conduction
what are the impulses transmitted across
a synapse or cleft by chemical means
where are neurotransmitters stored
synaptic vessicles in the terminal ends of axons
what signals increase membrane permeability making it easier and more likely for
depolarization
excitatory signals
which signals lower membrane permeability and make it unlikely that an impulse will start
inhibitory signals
what serves to lower the threshold stimulus
facilitaion
what is a grouping of insulated myelinated axons
white matter
what are groupings of uninsulated non-myelinated axons, dendrites and perikaryons called
grey matter
what do dorsal roots contain
sensory nerve fibers only
what do ventral roots contain
motor neurons only
what kind of impulses are in the autonomic nervous system
excitatory and inhibitory
what are action potentials that reach the brain via sensory neurons
sensations
what is an interpretation of a sensation ( a conscious awareness)
a percetpion
what is transduction
when a stimulus energy is converted into neural impulses by the receptor
what is transduction
when a stimulus energy is converted into neural impulses by the receptor
to be sensed for taste and smell, what must molecules of a substance do
dissolve in mucus to get to the receptors
where do olfactory receptors axons pass through (smell)
the cribiform plate and into the olfacory bulb
what is the fibrous tunic consisted of
sclera and cornea
what is the vascular tunic composed of
choroid, cilliary body, and iris
what is the anterior cavity
space anterior to the lens filled with aqueous humor
whata does aqueous humor do
nourishes cornea and maintains eye shape by pressure
what is the posterior cavity
filled with vitreous humor
what seperates the anterior and posterior cavity
lens
how many bi polar neurons are there per cone
one
why can cones only start an imipulse in bright light
they synapse with only one bipolar neuron
why is the optic disk a blind spot
there are no rods or cones
what is included in the external ear
pinna, external auditory meatus, tympanic membrane
what is included in the middle ear
the ossicles- malleus incus & stapes, oval window, round window, and auditory tube
what is in the inner ear
cochlea, vestibule, semiciruclar canals