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what is tha all-or-none rule
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when an impulse is fired, it needs to be fired with all the speed it can, if there isn't enough power, then the impulse won't fire at all
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what is tha all-or-none rule
when an impulse is fired, it needs to be fired with all the speed it can, if there isn't enough power, then the impulse won't fire at all
function of the nervous system
to receive information about change in the environment, interpret that information, then put an act into response
structutre of the nervous system
made up of the CNS and PNS
types of nerve cells
gluial-glue cells which protect the axon
3 types of neurons
interneuron, motor, sensory
what is a nerve impulse
an electrical charge that races along neurons from the point of stimulus
what happens in a nerve impulse
all-or-none rule
quadriplegia
c: disease or injury along nerve path from brain to muscles s: paralysis of all 4 limbs and internal organs t: immediate treatment
paraplegia
c: disease or injury along nerve path from brain to muscle s: paralysis of legs and lower internal organs t: immediate treatment
multiple sclerosis
c: unknown but myelin sheath around nerve cells s: blurring or loss of vision t: no cure
parkinson's disease
c: unknown, possibly environmental s: tremors, muscle stiffness t: no cure
alzheimer's disease
c: unknown, maybe viral s: forgetfulness, loss of memory t: no cure
encephalitis
c: inflammation of the brain s: headache, fever t: no treament
meningitis
c:infection of the meninges by bacteria s: headache, stiff neck t: early antibiotics, after 24-72 hours, death
poliomyelitis
c: viral- enters digestion system s: headache, fever, vomiting t: preventable with polio vaccine
rabies
c: viral, enters through animal bite s: 2 stages t: daily shots for 30 days
epilepsy
c: not always known, usually at birth s: repeated seizures t: drugs
PKU
c: genetic s: if infant with PKU eats food with phenylalanine, it builds up and causes brain damage t: completely curable if treated immediately
down's syndrome
c: genetic s: unique facial features, mental retardation t: amniocentesis and abortion
cerebral palsy
c: unknown for certain s: brain damage t: no cure
neurons are long threadlike cells that carry _________ signals called _________
electromagentic and impulses
the cell body of a neuron is also called
soma
where on the neuron are the dendrites located
on top of near the soma on a motor neuron
what is the job of a dendrite
to direct incoming impulse toward the soma
what is the job of the axon
speeds up the impulse
what is the job of the myelin sheath
insulates the axon
what do the synaptic end bulbs contain
neurotransmitters
the axon can reach lengths of three feet or more. in what way might this be important
to get the impulse to where it's going faster
how many neurons are in the human nervous system
trillions
where are most of the neurons located
CNS
what is a nerve
a bundle of neurons
what is a mixed nerve
it contains both sensory and motor neurons
what do sensory neurons do
carry stimuli
what do motor neurons do
send signals from the brain to the muscles
how is a nerve different from a neuron
a nerve contains neurons
how did the median nerve get it's name
it is in the middle of the spine
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