ch 10 pt 5 anatomy crossbridge cycling Flashcards
1
Q
First step of crossbridge cycling
A
Crossbridge formation
2
Q
Second step of crossbridge cycling
A
Power stroke
3
Q
Third step of crossbridge cycling
A
Release of myosin head
4
Q
Fourth step of crossbridge cycling
A
Reset myosin head
5
Q
Crossbridge formation
A
Myosin head binds to actin active site
6
Q
Power stroke
A
Myosin head pulls thin filament toward center of sarcomere
7
Q
Release of myosin head
A
ATP binds to myosin head causing its release from actin
8
Q
Reset myosin head
A
Provides energy to “cock” the myosin head
9
Q
Cycling continues as long as what is presented
A
Ca2+ and ATP are present
10
Q
Results in sarcomere shortening what
A
As Z discs move closer together
