Question

muscle contraction interactive and video
atp is critical to muscle function. drag and drop the steps to show how atp works in the sarcomere. start with step 1 (in bold).
first step
step 1: a myosin head is attached to a binding site on actin.
atp binds to the myosin head and breaks the cross - bridge.
atp is hydrolyzed, \powering up\ the myosin head (which binds to actin).
adp and phosphate are released from the myosin head.
the power - stroke occurs as myosin pulls actin toward the center of the sarcomere.
last step
score: 100% submit response notes

Explanation:

Step1: Cross - bridge break

ATP binds to the myosin head and breaks the cross - bridge.

Step2: Hydrolysis of ATP

ATP is hydrolyzed, "powering up" the myosin head (which binds to actin).

Step3: Release of ADP and phosphate

ADP and phosphate are released from the myosin head.

Step4: Power - stroke

The power - stroke occurs as myosin pulls actin toward the center of the sarcomere.

Answer:

1. A myosin head is attached to a binding site on actin.
2. ATP binds to the myosin head and breaks the cross - bridge.
3. ATP is hydrolyzed, "powering up" the myosin head (which binds to actin).
4. ADP and phosphate are released from the myosin head.
5. The power - stroke occurs as myosin pulls actin toward the center of the sarcomere.