Site author Richard Steane
The BioTopics website gives access to interactive resource material, developed to support the learning and teaching of Biology at a variety of levels.
Brain and spinal cord = Central nervous
Nerves = peripheral nervous system
There are 3 main types of cells
(neurones), each with specific functions:
RECEPTORS receive information (usually from surroundings), &
generate a nervous impulse which passes along the "fibre" out
of the cell
Take information from sensory neurone, (process it) and may
pass impulse on to motor neurone.
Pass impulse along fibre to other organs (muscles or glands):
Nerves are a mixture of fibres of
sensory and motor neurones, i.e. 2 types - with impulses moving in
However in each type of neurone
the impulse is unidirectional. No impulse passes back to the sensory
neurone, nor from the muscle to the motor neurone.
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