Final answer:
The charge nurse acts as the delegator in the absence of the registered nurse, overseeing the work of other nursing staff like LPNs and Nursing Assistants.
Step-by-step explanation:
In the absence of the registered nurse, the role of a delegator is often taken on by the charge nurse. The charge nurse is responsible for the coordination of nursing care on a particular shift or unit and has the authority to delegate tasks to other nursing staff members, which includes Licensed Practical Nurses (LPNs) and Nursing Assistants. This is in contrast to Physician Assistants (PAs), who work under the supervision of physicians and do not typically assume the role of delegating nursing tasks.