2- AP and the Synapse Flashcards
1
Q
RMP (voltage)
A
-70 to -90 mV
2
Q
Properties of AP
A
Threshold
All or nothing opening of VG Na channels
Conduction without decay
AP is followed by refractory
3
Q
Purpose of Refractory Period
A
Ensures forward movement of AP (polarity)
4
Q
Conduction Velocity in Unmyelinate Axons Determined By
A
Diameter
Large diameter= faster
5
Q
Synthesis of Small Molecule NTs
A
In axon terminal
i.e. ACh by ChAT
6
Q
Synthesis of Peptide NT
A
Synthesized in cell body and transported to terminal
7
Q
Gap Junctions
A
Made up of connexons
No NT needed (electrically coupled)
8
Q
Neuron Impermeable to
A
Ca
Na
9
Q
Neuron Permeable to
A
Cl
K
10
Q
Advantage of Gap Junction
A
No delay in transmiting info
Useful for neurons that need to fire synchrounously
Don’t need NT
11
Q
Disadvantage of Gap Junction
A
Loss of individuality
One cell fires= all fire
