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The Nervous System
Transcript of The Nervous System
Most multicellular organisms have a nervous system, the network that helps you process what is going on in your surrounding environment, and how to react accordingly. No matter how complex or simple the system, it will be made up of a central system, the brain and spinal cord, and the peripheral system, the network of nerves spread throughout your body.
The first form of a nervous system was discovered in a worm-like organism 550 million-600 million years ago. Now, its hard to imagine any sort of organism not having the same nerves we do.
Without the nervous system, we would have no way of processing what is going on around us. We couldn't send signals from our brain to our fingers to tell them to pick up our pencils. We wouldn't have the optic nerves that let us view our surroundings. The nervous system is what we consider the most important system.
Question 1) What organ system do vertebrate animals use to help them respond to the environment?
Animals similar to a jellyfish don't have the central nervous system we have, but instead what is called a nerve net. The way it is formed is similar to the peripheral system, because it is a network of cells, except it connects to the sensory and and muscular cells. It still does the job of the central nervous system, but it is formed in a different way.