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Communication Within

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by

Jason Whetten

on 30 January 2017

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Transcript of Communication Within

Balance of Two Forces
DIFFUSION
The Reflex
Saltatory Conduction
Questions?
Communication Within
the Neuron

How do we measure Electric Potentials?
Jason Whetten
The Role of Inhibition
Membrane Potential
Resting Potential
Depolarization
Hyperpolarization
Action Potential
-70 mV
Reduction in membrane potential
Increase in membrane potential
ELECTROSTATIC
PRESSURE
Molecules distribute evenly
High
Concentration
Low
Concentration
Attraction and Repulsion
Opposites Attract
Likes Repel
CATIONS - POSITIVE CHARGE
Potassium (K+)
Sodium (Na+)
ANIONS - NEGATIVE CHARGE
Organic Ions (A-)
Chloride (Cl-)
Organic Ions (A-)
Potassium (K+)
Chloride (Ch-)
Sodium (Na+)
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
1
2
3
4
5
6
ACTIVITY
Soma - Podium
Axon - Aisles
2 K+ Channels
2 Na+ Channels
1 K+/Na+ Pump
STUCTURE
ACTIVITY
IONS
Potassium
Sodium
Anions
A-
K+
K+
Cl-
Cl-
Na+
Na+
Positive
Negative
NEURAL PATHWAYS
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?
Intensity
Rate Law
Rate of firing
Full transcript