Answer: such involuntary functions are governed by the Autonomic nervous system
Explanation:
It is the duty of the autonomic nervous system to regulate certain involuntary actions in the human body such as blood-vessel movement, heart rate, breathing, digestion, urination, sexual arousal, pupillary responses, secretion of body fluids like saliva and sweat, control of body temperature, emotional responses etc.
The Autonomic nervous system is made up of two components which does work in opposition to each other. These components are - The Parasympathetic nervous system and the sympathetic nervous system. The later is the one that is responsible for our response to danger (flight-or-fight responses) and the former is responsible for maintaining normal body functions. It also helps in bladder control and slowing down of heart rate.