the nervous system

Brain: The command center that makes decisions, sends signals, and controls everything you do, even when you're not thinking about it.

Spinal cord: The main highway that carries messages between the brain and the rest of your body.

Nerves: The cables that branch out from the spinal cord, sending signals to your muscles and organs.

Sensory organs: Eyes, ears, skin, nose, and tongue collect information from the world and send it to the brain.