A patient in the hospital is being given a saline solution through an IV. Each day, she or he receives 1200 g of water through the IV. She or he receives water through no other means. A catheter collects all the urine leaving her or his bladder. It is determined that the daily water loss in the urine is 1600 g. Assume that water leaves her or his body through no other means. Metabolic activity is known to be normal. While the patient is in the hospital for a week, the physician notices that she or he loses no weight. (From this, assume that the mass of water in the body does not change with time.) Yet, a quick mass balance on water that incorporates only the Inlet and Outlet terms doesnt make sense. Help the physician resolve this puzzle by defining whether the system is open or closed, steady-state or dynamic, or reacting or nonreacting. What is going on? Try to find some biological evidence to support your hypothesis. Finally, write the accounting equation with appropriate terms to describe the water balance in the patient.