1. Electricity & Chemistry Our Nervous System only works thanks to electricity!

2. Electricity & Chemistry Electricity is the movement of electrons from negative to positive Electricity is the movement of electrons from negative to positive Electricity creates an electrical discharge or an electrical current Electricity creates an electrical discharge or an electrical current

3. Electricity & Chemistry Electrical potential (voltage) is how much energy can transfer from the negative side of a battery to the positive side. Electrical potential (voltage) is how much energy can transfer from the negative side of a battery to the positive side. This potential energy is in the form of electrons This potential energy is in the form of electrons (-)(+)

4. Electricity & Chemistry Potential difference is measured in Volts Potential difference is measured in Volts The more potential difference, the higher the voltage. The more potential difference, the higher the voltage. 1.5 volts 6 volts 9 volts

5. Electricity & Chemistry

6. In the Human Body Nerve Cells (called neurons) send messages around your body Nerve Cells (called neurons) send messages around your body These messages will do everything from move muscles to produce brain signals These messages will do everything from move muscles to produce brain signals

7. Electricity & Chemistry Some Chemicals in the body are electrically charged (negative or positive) Some Chemicals in the body are electrically charged (negative or positive) JUST LIKE THE BATTERY Na(+) Cl(-)

8. Electricity & Chemistry The important electrically charged chemicals for the nervous system are: The important electrically charged chemicals for the nervous system are: –Sodium (positive) –Potassium (positive) –Calcium (positive) –Chloride (negative)

9. Electricity & Chemistry Neurons, when not in use, sit, waiting to be used Neurons, when not in use, sit, waiting to be used JUST LIKE A BATTERY The inside of the neuron has a negative charge, whereas the outside of the neuron has a positive charge The inside of the neuron has a negative charge, whereas the outside of the neuron has a positive charge JUST LIKE A BATTERY

10. Electricity & Chemistry Outside of the Nerve Cell Inside of the Nerve Cell

11. Electricity & Chemistry BatteryNerve Cell

12. Electricity & Chemistry Potential Difference Potential Difference Battery: 1.5 volt – 9 volt Neuron: -70 millivolts (mV) = 0.07 volts

13. Electricity & Chemistry As a chemical current flows in or out of the cell, it creates an increase in voltage As a chemical current flows in or out of the cell, it creates an increase in voltage JUST LIKE A BATTERY

14. Electricity & Chemistry The Physics of electricity have been found to play a part in how our body works. Electricity and Chemistry are related