Final answer:
In the emergency room, a nurse typically obtains the prescribed IV potassium chloride from an emergency kit, which is pre-stocked with commonly used medications and solutions.
Step-by-step explanation:
When a physician in a hospital emergency room orders an intravenous (IV) solution, the protocol for delivery is generally more standardized than the scenario of an aide running to a supply cabinet to retrieve an IV bag. Instead, emergency kits or crash carts containing a range of medications and IV solutions are typically kept in or near the emergency room for immediate access.