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Nerves

A special type of cell is found in a sense called an Organ
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g
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Receptors respond to Stimuli, and then transmit an electrical impulse
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The cones respond too bright light and
colours, then transmit an impulse to
the CNS
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A receptor detects a stimulus
then transmits an impulse
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A sensory neurone carry’s an impulse
from the receptor to the CNS,
compromising of the brain and spinal
cord
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3
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Structure of the nervous system

Receptor

sensory neurone

CNS

motor neurone

effector

What does the CNS consist of?
Brain and spinal cord

Effector organ

function

Muscles

Movement / contracts

Gland

Secrete chemicals

The function of a receptor is to:
Detect a stimulus and transmit an impulse
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How – No conscious thought
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Examples – “The iris reflex” Muscles contract to close the pupil and prevent too much light
damaging the retina
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To correct this, the shape of the artificial lens should be thick
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To correct this the shape of the artificial lens should be thin
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Surgery is the only treatment to cure a cataract
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The lens is removed by – using ultrasound which breaks it up
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The old lens is replaced with a new lens
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– Involved
in starting voluntary
movement, memory,
personality, intelligence
and conscious thought

Responsible for many
reflex actions including
control of blood pressure,
heart rate and breathing
rate

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