That unbinding causes a small change in its shape, which lets a fresh ATP binds there in its place.

这种解除结合会导致其形状的微小变化，从而让新的 ATP 在原位结合。

Its their use of calcium and ATP that causes the binding and unbinding that makes sarcomeres contract and relax.

正是它们对钙和三磷酸腺苷的使用导致了使肌节收缩和放松的结合和松弛。