autonomic nervous system
noun/ˌɔːtənɒmɪk ˈnɜːvəs sɪstəm/
/ˌɔːtənɑːmɪk ˈnɜːrvəs sɪstəm/
(specialist)- the part of your nervous system that controls processes that are unconscious, for example the process of your heart beating
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autonomic nervous system