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Receptors
Photoreceptors
Sensitive
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Cards (7)
Rods
are very what?
Sensitive
to light - work well in dim light
Which type of photoreceptor is very sensitive to light?
rODS
where do
rods
work well?
in dim light
Why are rods very sensitive to light?
Because
many
rods
join
one
neurone
, so
many
weak
generator
potentials
combine
to
reach
the
threshold
and
trigger
an
action
potential
Cones
are what?
Less sensitive than
rods
(bright light)
Where do cones work best?
in bright light
Why are
cones
less sensitive?
Because one cone joins one
neurone
, so it takes more light to reach the
threshold
and trigger an
action potential
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