What anatomical structures are primarily visualized during an IVP?

An intravenous pyelogram (IVP) is a diagnostic imaging procedure primarily used to visualize the urinary tract, which includes the kidneys, renal pelvis, ureters, and bladder. During this procedure, a contrast dye is injected into a vein, allowing these structures to be imaged effectively on X-rays as the dye travels through the urinary system. This helps identify any abnormalities, blockages, or conditions affecting these organs.

The other options are associated with different anatomical systems or procedures. For instance, the liver, spleen, and pancreas pertain to the digestive system and are typically visualized using other forms of imaging, such as ultrasound or CT scans. The heart and lungs are part of the cardiovascular and respiratory systems, respectively, and are not the focus of an IVP. Similarly, the stomach and intestines, which belong to the gastrointestinal system, are evaluated using different imaging techniques. Therefore, the correct answer reflects the structures that are specifically targeted by the IVP procedure.