The autonomic nervous system is included in the peripheral system and is largely unconscious. It controls vital body functions such as heart rate, swallowing, breathing, digestion, and arousal.
The typical incubation period for a cold is 1-3 days. This means that it takes between 24 and 72 hours from the time you are exposed to the virus until you start to experience symptoms. Of course, this doesn't mean you will get sick every time you are exposed to a cold virus.
Three weeks is too long as an incubation period for a common cold. The incubation period is usually a few days in most people, but it can be up to a week. If you had said two weeks, then I would have said maybe, but I doubt that you picked up the cold from your friend.he common cold incubation period varies greatly from one person to the next. Symptoms can appear in just a few hours or as long as 10 days after exposure. The average incubation period is one to three days.