LC Nervous system

a single nerve cell

Carry electrical messages (ions) to the central nervous system

carry electrical messages away from the central nervous system

convert sensory messages to motor messages in the brain/ spinal cord

carries information between sensory and motor neurons

A chemical produced by the synaptic swellings that carry an electrical impulse across the synaptic clef

the immediate, involuntary and automatic response of the body to a stimulus not under conscious control

The Pathway taken by a reflex action through the spinal cord

rich in cell bodies

rich in axons

brain and spinal cord

All nerves that feed into the central nervous system

carry impulses away from the cell body

A group of cell bodies located outside the CNS

The minimum stimulus needed to cause an impulse to be carried in a neuron

if the threshold is reached an impulse is carried, but if the threshold is not reacted no impulse is carried

A short time span after a neuron has carried an impulse during which a stimulus fails to cause a response

A region where two neurons come into close contact

region including the axon of one neuron and dendrite of another neuron

The tiny gap between the two neurons at a synapse.

the gap between the axon of one neuron and dendrite of another neuron

Chemical produced to carry electrical impulse across the synaptic clef gap.

E.g include dopamine, acetylcholine, and noradrenalin

• 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

Composed of lipids


Acts as an insulator and speed up the rate of transmission of the electrical impulse