ummm.. i think only the nervous sys.What two body systems control the reflex action?
A reflex action is involuntary and almost instant movement in response to stimulus.[1] In most contexts, especially involving humans, a reflex action is mediated via the reflex arc (although this is not always true in other animals, or in more casual usage of the term 'reflex'.)
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nerves and muscles.
the brain is not involved, most reflex arcs occur in the spine. The brain is only aware of the involuntry reflex after it has happened.
it cant be the endocrine system - imagine if you stood on a pin, and it took a week for the message to get to your brain!
a great example of a reflex arc is the cross extensor reflex. you stand on a pin, and the other leg will extend to take the weight off the foot with the pin in it. all of the communication happens in the bottom end of the spine, as it is quicker than to send the message to the brain and wait for a response
hope this helps!
Um, it's jut the nervous system as far as I know.
A reflex is simply a signal triggered by, say, a muscle which passes through a nerve, hits the spine and instead of going up to the brain travels back to the muscle thus triggering a quicker response.
The nervous system and the muscular system the nervous system because the message has to travel throught the nerves to the muscles and the muscular system because you have to move a muscle to have a reflex.
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