Final answer:
The correct answer is 'c. primary care', where a registered nurse not only provides direct care but also continuously updates the patient's care plan. This model involves a more personalized approach compared to other models like functional care, team nursing, or case management.
Step-by-step explanation:
The care delivery model in which a registered nurse provides direct care and also has 24-hour responsibility for updating the patient's plan of care is known as primary care. In this model, the registered nurse oversees the continuum of care for a patient, often in a one-to-one relationship. This model is distinct from options such as functional care, which typically involves task-oriented responsibilities divided among several members of the staff, team nursing, which includes a group of nurses working together to care for a group of patients, and case management, where the focus is on the coordination of care and resources for patients with complex healthcare needs.
In the context of dialysis treatments, a registered nurse might directly supervise dialysis technicians, who perform a range of duties under the nurse's oversight. Dialysis technicians work in environments such as hospitals and clinics, where they provide direct patient care including reviewing history, assessing patient needs, and monitoring treatments.