Explanation:
autonomic nervous system because it regulates homeostasis that receives signals from the body
One law or legislation relevant to xenophobia would be the temporary immigration ban that was enforced by Barrack Obama in 2011, where he had a temporary hiatus on people coming from Iraq. This was something that can be classified as a clear case of xenophobia - people coming from this area were all unjustly treated as being or belonging to some sort of unsafe network of terrorists.