Biology – Reflex Actions

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  • Created on: 14-12-16 10:20
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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 the nerve impulse
The muscle contracts, this is the effector.

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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.…read more

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