During muscle contraction, the cross-bridge detaches when 1  ________. the myosin head binds to an ADP molecule. 2  the myosin head binds to an ATP molecule. 3  calcium ions bind to troponin. 4  calcium ions bind to actin.
A plant operator is a person who supervises the operation of an industrial plant. The term is usually applied to power plants or chemical plants such as gas extraction, petrochemical or oil refinery or other chemical processes.There may be a control room in the plant where the operator works.These are known as board operators. Generally, operators are assigned to a particular unit, on which they are responsible for a certain function or area of equipment.he term is usually applied to power plants or chemical plants such as gas extraction, petrochemical or oil refinery or other chemical processes. There may be a control room in the plant where the operator works.
A wheeled front loader at work. This wheeled tractor is equipped with a large bucket, which can be raised or lowered by hydraulic arms. A heavy equipment operator operates heavy equipment used in engineering and construction projects. Typically only skilled workers may operate heavy equipment, and there is specialized training for learning to use heavy equipment. Much publication about heavy equipment operators focuses on improving safety for such workers.