Kaplan Nursing Entrance Practice Exam 2025 – The All-in-One Guide to Exam Success!

The function of the kidneys is primarily to remove nitrogenous wastes and regulate fluid balance in the body. They achieve this through a process called filtration, where blood is filtered to remove waste products such as urea, creatinine, and excess salts. This filtration process is part of urine formation, which allows the body to excrete these wastes effectively.

In addition to waste removal, the kidneys play a crucial role in maintaining the body's fluid balance by adjusting the volume and concentration of urine produced. They help in regulating electrolytes, blood pressure, and the overall homeostasis of body fluids. This balancing act is vital for overall health, as it ensures that cells and tissues function optimally without being compromised by excess wastes or imbalances in fluid levels.

The other options describe functions attributed to other organs and systems in the body. For instance, insulin production and blood sugar regulation are functions of the pancreas. Bile production for digestion is a function of the liver, and the pumping of blood throughout the body is the primary function of the heart. Therefore, option B accurately captures the essential roles of the kidneys in maintaining bodily health.