Now, what takes place once they actually bind? So once the thick filament and our thin filament actually bind to each other as a result of our myosin head, step number five takes place. In step number five, the phosphate group and the ADP group are basically released from our myosin head. And as this is released, that causes the change in orientation of the mycin head. The myosin head once again goes from a 90 degree angle to about a 45 degree angle. And as that takes place, that moves our thin filaments towards each other.