LC Nervous system
What is a neuron?
a single nerve cell
Carry electrical messages (ions)
to the central nervous system
carry electrical messages away
from the central nervous system
What is an interneuron?
sensory messages to motor messages in the brain/ spinal cord
carries information between sensory and motor neurons
the synaptic swellings
that carry an electrical impulse
across the synaptic clef
What is a reflex action?
of the body to a
stimulus not under conscious control
What is the reflex arc?
taken by a
through the spinal cord
What is the central nervous system?
brain and spinal cord
What is the peripheral nervous system?
feed into the central nervous system
from the cell body
What is the ganglion
A group of
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?
carry electrical impulse across
synaptic clef gap.
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
speed up the rate of transmission
of the electrical impulse
What is the myelin sheath
Acts as an
speed up the rate of transmission of the electrical impulse
Draw an image of the brain.
And label all the parts
LC Nervous system
key words and flashcards