The sympathetic nervous system is one of the two main divisions of the autonomic nervous system, the other being the parasympathetic nervous system.

The parasympathetic nervous system (abbreviated PN to avoid confusion with the peripheral nervous system (PNS)) is one of the two divisions of the autonomic nervous system, the other being the sympathetic nervous system.

Nerve fibres of the parasympathetic nervous system arise from the central nervous system.

Oligodendrocytes and central nervous system myelin.

An increase in sympathetic nervous system stimulation causes the heart rate to increase, both by the direct action of sympathetic nerve fibers on the heart and by causing the endocrine system to release hormones such as epinephrine (adrenaline), which have a similar effect.

The central nervous system consists of four organs.

The development of the nervous system in radiata is relatively unstructured.

Cocaine, caffeine, and cathinone are stimulants of the central nervous system.

Hospitals were flooded with patients showing symptoms of damage to the central nervous system.

I'm nervous.

You're nervous.

We're nervous.

She told me that she was sympathetic.

Cells The nervous system contains two main categories or types of cells neurons and glial cells.

We are more sympathetic to the second criticism.

Some were more sympathetic towards the bridesmaid s decision.

Everyone was nervous.

You seem nervous.

They became nervous.

Tom is nervous.

Tom got nervous.

Tom became nervous.

Don't be nervous.

Don't be nervous.

Don't be nervous.

I wasn't nervous.

You look nervous.

I'm not nervous.

You're just nervous.

You're too nervous.

You're too nervous.

We're just nervous.

We're all nervous.

Is Tom nervous?

Are you nervous?

I got nervous.

I got nervous.

I got nervous.

I was nervous.

I was nervous.

I'm feeling nervous.

I'm feeling nervous.

I'm getting nervous.

I'm getting nervous.

I'm very nervous.