The autonomic nervous system (ANS) regulates the functions of our internal organs (the viscera) such as the heart, stomach and intestines.
The flu is contagious a day before and five days to a week after its onset. Young children, people over 65, those with compromised immune systems, and people with a terminal illness are at risk of death from the flu.
Originally Answered: How long am I contagious when I have the flu or a colds? Flu: 5â7 days after you become sick. Cold: About a week, but you are most contagious in the first 2 or 3 days.