The autonomic nervous systems control involuntary bodily functions.

The vegetative nervous systems control involuntary bodily functions.

The parasympathetic nervous systems regulate rest and digestion.

She was as nervous as a whore in church.

The peripheral nervous systems are responsible for transmitting signals between the central nervous system and the rest of the body.

She looked nervously at the clock, waiting for her interview to start.

Her nervousness was evident as she fidgeted with her hands.

She has many nervousnesses before giving a presentation.