Nervous System
The body’s fast control and communication network — electrical signaling that operates in milliseconds.
Main parts
Section titled “Main parts”- Central nervous system — the brain and spinal cord; where information is processed.
- Peripheral nervous system — the nerves linking the CNS to the rest of the body.
- Autonomic nervous system — the division controlling involuntary, automatic functions.
- Neurons — the signaling cells that carry electrical impulses.
- Glia — the support cells that nourish, insulate, and protect neurons.
What it does
Section titled “What it does”- Senses — gathers information from inside and outside the body.
- Integrates — interprets that information and decides on a response.
- Commands — directs muscles and glands to act.
- Autonomic control — runs background functions (heartbeat, digestion) without conscious effort.
Key idea
Section titled “Key idea”The nervous system is the body’s fast controller, working alongside the slower, chemical endocrine system. Note that the physical brain is described here; thinking, feeling, and behavior — what the brain produces — are covered separately under the the-mind root.