Four Step Contraction

Question 0

Step 2

Answer 0

• Inorganic Phosphate is released.
• Myosin head pivots and bends to pull actin filament to center of sarcomere.
• ADP released

Question 1

Step 1

Answer 1

Myosin head attaches to actin; formation of cross bridge

Question 2

Step 3

Answer 2

New ATP reaches myosin head & cross bridge detaches

Question 3

Step 4

Answer 3

• ATP is split into ADP and P (ATP HYDROLYSIS)

- myosin head cocks into high energy confirmation