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LC Nervous system
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What is a neuron?
a single nerve cell
Sensory neuron
Carry electrical messages (ions)
to the central nervous system
Motor neuron
carry electrical messages away
from the central nervous system
What is an interneuron?
convert
sensory messages to motor messages in the brain/ spinal cord
carries information between sensory and motor neurons
Neurotransmitter
A
chemical produced
by
the synaptic swellings
that carry an electrical impulse
across the synaptic clef
What is a reflex action?
the
immediate
,
involuntary
and
automatic
response
of the body to a
stimulus not under conscious control
What is the reflex arc?
The
Pathway
taken by a
reflex action
through the spinal cord
Grey matter
rich in
cell bodies
White matter
rich in
axons
What is the central nervous system?
brain and spinal cord
What is the peripheral nervous system?
All
nerves
that
feed into the central nervous system
Axon
carry impulses
away
from the cell body
What is the ganglion
A group of
cell bodies
located
outside the CNS
What is the threshold?
The minimum stimulus needed to cause an impulse to be carried in a neuron
What is the all or nothing law?
if the threshold is reached an impulse is carried, but if the threshold is not reacted no impulse is carried
What is the refractory period?
A short time span after a neuron has carried an impulse during which a stimulus fails to cause a response
What is the synapse?
A region where two neurons come into close contact
region including the axon of one neuron and dendrite of another neuron
What is the synaptic clef?
The tiny gap between the two neurons at a synapse.
the gap between the axon of one neuron and dendrite of another neuron
What is the function of the neurotransmitter?
Chemical
produced to
carry electrical impulse across
the
synaptic clef gap.
E.g include
dopamine, acetylcholine, and noradrenalin
What is a Schwann cell?
Cells lie end to
providing a protective layer around the axon.
As well as a protective function, these cells act as an
insulator
and
speed up the rate of transmission
of the electrical impulse
What is the myelin sheath
Composed of
lipids
Acts as an
insulator
and
speed up the rate of transmission of the electrical impulse
Draw an image of the brain.
And label all the parts
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Author
cat126
ID
351522
Card Set
LC Nervous system
Description
key words and flashcards
Updated
2020-04-27T09:27:04Z
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