NERVOUS NERVOUS THE SYSTEM ROURKE Media Educational Shirley Duke rourkeeducationalmedia com Teacher Notes available at rem4teachers com
CHAPTER ONE Parts of the Nervous System Hop on a skateboard and push off Eyes arms legs and muscles must coordinate to stay balanced and keep moving How is this possible Humans have a complex command center to run the body called the nervous system The brain spinal cord and nerves form the nervous system This system receives interprets and relays information to manage and direct everything happening in the body Electrical signals called impulses carry information They move from the body to the brain and back again Did You Know Living organisms develop in an ordered way The smallest unit of life is a cell Like cells doing the same job form tissues Tissues working together make an organ Organs working together on the same process create a system All the different systems working together make an organism 4
The nervous system is divided into two parts The brain and spinal cord make up the central nervous system CNS The peripheral nervous system PNS is all the nerves outside the brain and spinal cord The nerves of the PNS connect the sense organs and other body activities to the CNS Messages move through neurons or nerve cells Bodies hold around 100 billion neurons Another 100 billion neurons make up the brain The impulses from these cells move in different directions to carry their messages Bundles of neurons form nerves Central Nervous System Brain Spinal Cord Peripheral Nervous System Motor Nerves Nerve Neuron Bundle Sensory Nerves Blood Vessel Axion Connective Tissue 5
