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BIOLOGY
6. STIMULI
Reflexes
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Cards (7)
what are reflexes?
rapid
, automatic responses to
stimuli
What is a
reflex
?
where the body responds to a
stimulus
without making a
conscious
decision to respond
why does info travel
really fast
from
receptors to effectors
?
Because you do NOT have
to
spend time deciding how
to respond
why do simple reflexes help organisms to protect the body?
they are
rapid
What is a reflex arc?
the pathway of neurones linking
receptors
to
effectors
in a reflex
Give example of a simple REFLEX ARC- the hand-withdrawal response to heat?
thermoreceptors
in skin detect heat stimulus
sensory
neurone carries impulses to
relay
neurone
Relay neurone connects to the
motor
neurone
motor neurone sends impulses to
effector
(biceps muscle)
muscle
contracts
to withdraw hand & stop it being
damaged
What is possible if there is a relay neurone involved in the simple reflex?
It is possible to override the reflex eg
brain
could tell hand to withstand the
heat