7 - SLIDING FILAMENT THEORY Flashcards
1
Q
1ST STEP
A
Ca2+ released from the sarcoplasmic reticulum of the myofibril
2
Q
2nd STEP
A
Ca2+ binds to troponin on actin, causing the actin-myosin blocking protein tropomyosin to move
3
Q
3rd STEP
A
Myosin heads can now bind to actin, forming a cross bridge
4
Q
4th STEP
A
Myosin heads nod forward, thus pulling the actin over the myosin
5
Q
5th STEP
A
Hydrolysis of ATP by ATPase on the myosin head supplies energy to enable the breaking of the actin myosin cross bridges and formation of new ones further away