Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
resting membrane potential (RMP) description
|
the difference between the charge inside and outside the membrane
|
|
|
in RMP the inside of sarcolemma is more ____ than outside
|
negative
|
|
|
in RMP there are more ____ ions outside the cell
|
positive
|
|
|
3 steps for action potential generation
|
depolarization - propagation - repolarization
|
|
|
action potential generation initial 3 steps
|
Ach released by motor neuron - binds to receptors on motor end plate - sodium ion channels open and allow sodium to enter sarcolemma
|
|
|
apg step 1 depolarization 4 details
|
sodium gates open - influx of sodium - inside of sarcolemma becomes less negative - sudden positive change in membrane potential is depolarization
|
|
|
apg step 2 propagation 4 details
|
the depolarization wave spreads to adjacent areas - depolarization travel down sarcolemma - reaches t-tubules + terminal cisternae - causes release of calcium into the sarcoplasm
|
|
|
apg step 3 repolarization 5 details
|
occurs immediately following depolarization - sodium gates close - potassium gates open (diffuses out) - sodium-potassium pump moves sodium out + potassium in to restore RMP - RMP becomes negative once again
|
|
|
absolute refractory period occurs during
|
repolarization
|
|
|
during absolute refractory period muscle fiber does not respond to
|
stimulus
|
|
|
depolarization summary
|
membrane potential becomes more positive
|
|
|
propagation summary
|
depolarization travels down sarcolemma + t-tubules deep into the muscle fiber
|
|
|
repolarization summary
|
RMP is restored back to its negative state
|
|
|
acetylcholinesterase (AchE) description
|
enzyme that breaks down ACh
|
|
|
what prevents continuous muscle contraction
|
acetylcholinesterase
|
|
|
acetylcholinesterase (AchE) prevents further nerve stimulation needed to continue
|
contraction
|
