![]() ![]() This is actually a lot like a telephone system or the Internet. In this way, the different parts of your body use electricity to communicate with one another. When you bite into it, your mouth sends signals to your brain telling you how it tastes. When you pick up the sandwich, the sensitive nerve cells in your hand send an electrical message to the brain, telling you what the sandwich feels like. Neurotransmitters tell the muscles to contract or expand in just the right way to put your sandwich together. The electrical signal tells the nerve cell to release a neurotransmitter, which is a communication chemical, to the muscle cells. ![]() When you want to make a sandwich, for example, your brain sends electricity down a nerve cell, toward the muscles in your arm. ![]() You need electricity to do just about anything. In fact, it's one of the most essential elements in your body. But in smaller doses, electricity is harmless. If lightning strikes you or you stick your finger in an electrical outlet, the current can maim or even kill you. We tend to think of electricity as a harmful force to our bodies. ![]()
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