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Transcript of Communication Within
How do we measure Electric Potentials?
The Role of Inhibition
Reduction in membrane potential
Increase in membrane potential
Molecules distribute evenly
Attraction and Repulsion
CATIONS - POSITIVE CHARGE
ANIONS - NEGATIVE CHARGE
Organic Ions (A-)
Organic Ions (A-)
All or Nothing Law
1. Voltage dependent Na+ channels open and Na+ floods the cell
2. Membrane potential moves from -70 mV to +40 mV
3. Voltage dependent K+ channels begin to open and K+ leaves the cell
4. Na+ channels close and become refractory
5. K+ continues to leave the cell until membrane potential nears normal
6. Na+ channels reset
7. Membrane overshoot resting potential but returns to normal as K+ diffuses
Soma - Podium
Axon - Aisles
2 K+ Channels
2 Na+ Channels
1 K+/Na+ Pump
Excitation or Inhibition
Channels open as they receive electric information
Starts at the Axon Hillock
Let's try another way...
Channels have rules.
Na+ opens at -55 and closes at +40
K+ opens at +40 and closes at -80
But Jason... If it is just all or nothing, how are responses in the body different?
Rate of firing