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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
THE REFLEX ARC
The reflex arc is the path a nerve impulse takes during a reflex
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.
Muscle contractions under conscious control, brought about by nerve cell
pathways from the brain linked to motor neurones.…read more