Pre contraction Flashcards
1
Q
What binds to the myosin head before contraction of a sarcomere can begin?
A
ATP
2
Q
What is the ATP broken down into? What mechanism is used?
A
“ADP, Pi and stored energy
hydrolization”
3
Q
What is cause by the binding of myosin head to the actin binding site?
A
release of Pi
4
Q
What initiates the power stroke?
A
release of Pi
5
Q
What is the powerstroke?
A
action that pulls thin filament toward mline (center)
6
Q
What is released at the end of the powerstroke?
A
ADP
7
Q
The release of ADP allows what step?
A
ATP attachment
8
Q
What releases the myosin head from the binding site on actin?
A
ATP attachment
9
Q
What ends a muscle contraction?
A
“lack of ATP
muscle reaches full contraction”
10
Q
What causes rigor mortis?
A
permanent cross-bridging caused by lack of available ATP to break the bond
