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Flashcards in Q2 Deck (15):
1

The "patch" action potential is non-propogating, meaning what?

It only occurs once.

2

What triggers the action potential?

Depolarization of the cell membrane.

3

Hodgkin and Huxley discovered the Na conductance in the giant axon of what animal?

Squid

4

Equilibrium potentials are based on external and internal concentrations of which 2 ions?

Na and K

5

T/F: Anesthetics procaine and lidocaine reduce only K conductances.

False

6

T/F: Tetrodotoxin is a highly specific blocker of Na channels.

True

7

In myasthenia gravis, what loses strength?

Acetylcholine affinity in neuromuscular junctions.

8

T/F: One treatment for myasthenia gravis decreases acetylcholine.

False

9

T/F: Release from inhibition can depolarize a cell.

True

10

Is there a critical stimulus current separating "all-or-none"?

Yes

11

Does threshold depend on temperature?

Yes

12

T/F: Small changes in stimulus amplitude have been shown to have a large effect on the postsynaptic response.

True

13

Sodium channels are remarkably sensitive to the extracellular concentration of what ion?

Ca2+

14

Increasing extracellular Ca2+ has what effect on nerve and muscle excitability?

Stabilizing

15

Can some neurons fire spontaneously without a stimulus?

Yes