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Reflexes and the Reflex Arc
Reflexes are responses that are
very quick and help
injured
...
you automatically move your
this
The passage of information in a reflex, from the receptor to the effectors is called a reflex arc
...
Often only a few neurones are involved, so the impulse of
doesn 5 have to travel far and can arrive at the effectors almost at once
...
Why?
Stages of a Reflex Arc
...
2
...
In the central nervous system the sensory
neurone passes the impulse to a relay
neurone, which relay the impulse to a
motor neurone
...
4,
The impulse travels along the motor
neurone to effectors, muscles in the hand
...
The time from the
stimulus to the response is about 0
...
Message travels 4
...
When message
reaches muscle, if
confracfe fo move
arm awag from bee
CNS
3
...
Simula±ion of
the pain receptor
t
...
QT