Final answer:
The registered nurse is primarily responsible for client outcomes in the functional model of care, coordinating day-to-day patient care and adjusting plans as necessary.
Step-by-step explanation:
In the functional model of care, the responsibility for client outcomes primarily rests with the registered nurse (RN). While other team members have specific roles, such as the medication nurse who handles medication administration, the charge nurse who may oversee the unit, and the nurse manager who is responsible for administrative oversight, it is the registered nurse who has the direct and continuous responsibility for coordinating the care for patients on a day-to-day basis. RNs assess patients, create and implement care plans, evaluate patient outcomes, and adjust care as necessary to ensure the highest standards of care are met.