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"I am nervous" is a common expression, but also a bit of a misnomer since everything we do is controlled by our nervous systems!
Yes, "systems", as there are two nervous systems, one called the autonomic system and the other the central system!
Autonomic means that it works outside our control (for the most part), such as digestion and breathing!
The central system is what we use to move, to look, to behave, etc..under our control!
So 'I am nervous" really means what?