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Biology ­ reflex actions

Definition of a reflex action
A rapid, automatic (or involuntary) response to a stimulus to sense to protect the body from
harm

THE REFLEX ARC




The reflex arc is the path a nerve impulse takes during a reflex
action.

In this example the pressure receptor generates…

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Reflex actions occur in a fraction of a second, and are not started
by brain impulses, but the brain is still aware of what is going on.


Voluntary action:
Muscle contractions under conscious control, brought about by nerve cell
pathways from the brain linked to motor neurones.

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