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The Reflex Arc
The reflex arc is a `pathway' which coordinates simple reflexes. It does this by
passing information from on part of the nervous system to another and then back
(from the peripheral nervous system to the central nervous system then back to
the peripheral nervous system): Nerve impulses are
The stimulus is carried along a
detected by the sensory neuron to
receptor cell. your CNS (brain or
spinal cord)
coordinates your
Nerve impulses are
carried along a motor
The effector carries neuron to an effector
out the response to
the stimulus…read more

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The Peripheral Nervous System
The peripheral nervous system is made up of the nerves which link your brain and
spinal cord to the other parts of your body.…read more

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The Central Nervous System
The central nervous system is made up of the brain and spinal cord. It coordinates
all of your responses to stimuli.…read more

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Nerves and Neurons
Nerves are groups of specialized cells called neurons. Neurons transmit electrical
The axon is made up of
cytoplasm found in normal
cells. The axon is the part
which carries the electrical
The fatty sheath is the part
around the axon which insulates
it from other neurons and also
increases the transmitting speed
of the neuron.
The branched endings are so
that the neuron can transmit
impulses to other neurons.…read more


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