Contraction Flashcards
1
Q
What stimulates the action potential?
A
Nervous system
2
Q
Where does the action potential occur?
A
Sarcolemma
3
Q
What is an action potential?
A
an electrical impulse
4
Q
Action potentials travel down the ______ to the _____.
A
“T Tubules
myofibrils”
5
Q
What does the action potential do?
A
trigger the release of Calcium ions
6
Q
Where are the calcium ions stored?
A
cisternae
7
Q
To what do calcium ions bind?
A
troponin
8
Q
What does calcium ion binding do?
A
binding to troponin causes tropomyosin to move, exposing binding sites on the actin for the myosin head of thick filaments
9
Q
What molecule prevents myosin heads from binding to the actin?
A
tropomyosin
10
Q
Myosin slides along actin, moving toward what structure?
A
z disc
11
Q
Actin slides along the myosin, moving toward what structure?
A
m line
