The nervous system is primarily controlled by the brain, which sends and receives messages via the spinal cord and a network of nerves.
The Central Role of the Brain
The brain acts as the central command center for the entire body, orchestrating a vast array of functions. As the reference states, "The brain is what controls all the body's functions." This control is achieved through complex signaling pathways that involve both electrical and chemical communication.
The Spinal Cord: A Vital Relay
The spinal cord serves as a crucial communication link between the brain and the rest of the body. It's described as running "from the brain down through the back" and containing "threadlike nerves that branch out to every organ and body part."
Nerves: The Messengers
Nerves extend from the spinal cord, forming a vast network that reaches every part of the body. These nerves "relay messages back and forth from the brain to different parts of the body." This two-way communication allows the brain to receive sensory information and to send instructions for movement, hormone release, and other bodily functions.
Here's a breakdown in table format:
| Component | Role | Function |
|---|---|---|
| Brain | Central Command Center | Controls all bodily functions through signaling. |
| Spinal Cord | Communication Link | Relays messages between the brain and the body via nerves. |
| Nerves | Messengers | Transmit signals to and from the brain, enabling sensory input and motor output. |
