Ch 48 Pt 2 Flashcards
1
Q
Hyperpolarization
A
More negative
2
Q
Depolarization
A
Toward positive direction
3
Q
Repolarization
A
Negative back to resting potential
4
Q
Phases of action potential
A
Resting state (below threshold) Depolarization (slow rise to threshold) Rising phase (upslope peak) Falling phase (downslope peak) Undershoot (dip below return to resting state)
5
Q
During rest, which ion has the strongest force to get inside the cell?
A
Na+
6
Q
Resting phase
A
All gates closed
7
Q
Depolarization
A
Na+ rushes into the cell
8
Q
Rising phase
A
A Lot of Na+ rushes into the cell
9
Q
Falling phase
A
Na+ gates close and K+ rushes out of the cell
10
Q
Undershoot
A
Na+ gates close and smaller K+ rush out of the cell
11
Q
Action potentials travel
A
Only toward synaptic terminals
12
Q
What prevents action potentials from traveling in the opposite direction
A
Potassium channels
13
Q
The axon is covered by
A
The myelin sheath
14
Q
The divots between myelin sheaths
A
Nodes of Ranvier
15
Q
One wrapped axon section
A
Schwann Cell
