Another way to say involuntary response is automatic response. This is not a reaction that the dog does with willful thought or consciously. The autonomic nervous system deals with functions of the body that involve involuntary response.
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Answer:
Autonomic nervous system
Explanation:
Pavlov's dogs salivated at the sight of a juicy steak. The salivation was an involuntary response. The autonomic nervous system is involved in the situation.