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.
You are most contagious right about the time you feel symptoms starting. But you should assume youâre able to spread the virus the entire time the cold lasts - typically 3 and 10 days. The contagious period for the flu is similar. A study found youâre most contagious during a 2-3 day period after the on-set of symptoms. But just like a cold, you can still spread influenza during the entire time youâre sick - anywhere between 2 and 10 days.