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.
Q: If I get the flu or a cold, how long am I contagious? A: Flu is spread by airborne particles and is contagious for about 3 to 5 days after symptoms appear. Typical symptoms include fever, headache, muscle pain, extreme fatigue and, sometimes, a runny nose and sore throat. MORE.