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The phone rings. Your ____ hears the sound. The ____ in your ear send a message to the brain. Your ____ decides to answer. Your brain sends a signal down the ____ and out through your nerves. The message is passed from neuron to neuron, through each ____, down the ____, and across the ____. It is like an electrical impulse relay race in your arm. Finally, the muscles in yourhand get the message to pick up the phone. Another ____ is sent from your brain, and you raisethe phone to your ear. Your ____ activates as you speak and listen. "Hello?" You are walking barefoot on the beach. All of a sudden, you step on something sharp, the ____ in your foot send a message from ____ neuron to sensory neuron to your central nervous system that says, "Hey, this hurts!" The ____ of one neuron receive the message as an____. They process the message in the ____, pass it through the ____, and across the ____ to another neuron. Eventually, the message arrives in your ____. Your brain and spinal cord respond with another message that gets passed along by a chain of ____ to the muscles in your foot: "Pull away now."

How the Nervous System Works

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