The nervous system splits, then splits again. First it splits into the central command center and the peripheral nerves that reach the body. Then it splits into voluntary and automatic control. Last, it splits into the arousing and calming systems. Explore the tree, then switch to Sort it to test yourself.
The nervous system tree
Tap a branch to explore it · or step through with Back / Next
The nervous systemtap a branch, or press Explore
Read the moment. Which branch is mainly in charge?