Bio Unit 1
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Neurons: Key feature and four parts.
Plasma membranes can generate and propagate electrical signals.
Cell body, dendrites, axon, axon terminals.
Where an axon terminal comes close to another cell & membranes are modified. Where info is transferred using chemical signals (neurotransmitters).
- Housekeeping functions:
- Supplying nourishment, maintaining proper ionic environment.
Do NOT generate action potentials
Pumps embedded in membrane that move ions against concentration gradient.
- Sodium potassium pump:
- 3 Na+ out
- 2 K+ in
Ion channels (3 things)
Pass ions through diffusion.
Each channel is ion-specific.
Some open, some gated.
Potassium Equilibrium Potential
The point where the diffusion of K+ ions out is balanced by the movement of K+ ions in due to negative electrical potential
*Very close to resting potential
Basic mechanism by which electrical signals are generated and propagated by neurons involving changes in the polarity of the plasma membrane.
Sudden and major, lasting 1-2 ms. and move along at speeds up to 100 m/s.
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