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The nervous system includes receptors
that detect stimuli (light, sound, changes in
position, chemicals, touch, pressure, pain
and temperature), the spinal cord, the
brain and effectors;
· These parts of the nervous system work
together to react to stimuli from the
surroundings and co-ordinate behaviour.…read more

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RECEPTOR CELLS DETECT STIMULUS
for instance temperature and pressure
sensors in the skin
· THE CENTRAL NERVOUS SYSTEM CO-
ORDINATES ALL OF THE
INFORMATION IT RECEIVES.
· THE EFFECTOR THEN RESPONDS,
THIS MIGHT BE A MUSCLE IN THE
ARM.…read more

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NERVOUS COMMUNICATION HAPPENS
BY ELECTRICAL NERVE IMPULSES
CONTROLLED BY THE BRAIN AND
SPINAL CORD.
· These responses last a very short time but
are very fast to respond.…read more

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Hormone Communication
· This is slower but longer lasting than nervous
communication. There are several main areas
which rely on hormones.
· Pituitary gland, makes hormones which control
other glands.
· Thyroid gland can affect growth.
· Pancreas makes the hormone INSULIN which
converts glucose to glycogen.
· The adrenal gland on the kidneys controls adrenalin
levels and therefore blood pressure.
· Sex hormones such as testosterone in males and
oestrogen in females regulate cycles such as the
menstrual cycle.…read more

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