Nervous system

Do you know how your friend pinches you and you get that sharp pain up your arm? Or how your wife rubs your back and that tingling makes it's way around? None of that would be possible without nerves. Nerves are those things you hear about that send impulses to your brain, and your brain sends back feeling. How does the impulse get to your brain? How does your brain send the feeling back? What is the impulse and feeling? All very valid questions. An impulse takes the form of a type of electricity, which travels up through the nerves and to your brain. Your brain interprets the impulse very quickly, and sends back chemicals, which travel inside of your nerves, and back to the location of the impulse start. In order for the chemicals to get there, you need nerve synapses. These are little tiny gaps between your nerves that contain the "guns" and "receivers" of the chemicals. Nerves also have a sheath covering them. Think of it as a cord. A cord is a bunch of metals wires wrapped in a rubber, or plastic, or whatever material sheath. This speeds up the process of the signal or impulse getting from point A to point B.