ut the following events describing how a muscle contracts in order from first (at the top) to last (at the bottom). (i) Instructions Calcium binds to troponin. Myosin head releases actin. Myosin head binds a molecule of ATP. Myosin heads attach to actin, forming cross bridges. Cross-bridges bend, causing the actin to slide past myosin. Myosin head swivels back to its original position.