Nervous+System+Notes+in+class+CC

**Nervous System**

 * nerves- bundle of nerve cells
 * spinal chord- biggest cord of nerve cells in your body
 * nerves branch off the spinal chord
 * reactions and responses are so quick because there are usually on 2 or 3 cells between the place of contact on your body and your brain
 * Action Potential- Sodium has a positive charge so when you send an action potential the sodium moves in and then the potassium moves out
 * positive charge can cross the synapse, so it sends a neuron transmitter.