Steps of Muscle Twitch Flashcards
1
Q
3 Periods of Muscle Contraction
A
Latent, contraction, relaxation
2
Q
1.
A
Somatic motor neuron action potential
3
Q
2.
A
Voltage-gated Ca2+ channels open
4
Q
3.
A
Ca2+ induces vesicle exocytosis
5
Q
4.
A
ACh released in synapse (NMJ)
6
Q
5.
A
ACh binds to motor end plate nicotinic receptors
7
Q
6.
A
Muscle cell depolarizes
8
Q
7.
A
Action potential travels along sarcolemma
9
Q
8.
A
Action potential travels spread down t-tubles
10
Q
9.
A
DHP channels change shape
11
Q
10.
A
RyR channels in SR open
12
Q
11.
A
Ca2+ enters sarcoplasm
13
Q
12.
A
Ca2+ bind to troponin
14
Q
13.
A
Tropomyosin is shifted off of binding sites
15
Q
Steps 1-13
A
Latent Period
Between motor neuron AP and force
