Question

put the steps of the interaction between actin and myosin during muscle contraction in order from first (1) to last (3).
the myosin head rotates, causing overlap with actin.
the myosin head attaches to a binding site on the actin filament.
the myosin head detaches from one binding site and reattaches to another.
done

Explanation:

To determine the order of the steps of actin - myosin interaction during muscle contraction, we recall the sliding filament theory. The first step is the attachment of the myosin head to the actin filament's binding site. Then, the myosin head rotates, which causes the overlap with actin (this is the power stroke). Finally, the myosin head detaches from one binding site and reattaches to another to continue the contraction cycle.

Answer:

1. The myosin head attaches to a binding site on the actin filament.
2. The myosin head rotates, causing overlap with actin.
3. The myosin head detaches from one binding site and reattaches to another.