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.
With some viruses, you're contagious for as long as you have symptoms or even beyond. With others, you continue to have symptoms after youâre no longer contagious. Adults who have the flu are contagious for five days after first developing symptoms, while kids can stay contagious even longer. If you have a cold, you're most likely to give it to someone else during the first few days of having a runny nose, sneezing, and coughing.