The primary functions of the kidneys:

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The kidneys produce urine through filtration, reabsorption, and secretion processes. They also help regulate body fluids by controlling the balance of electrolytes and water in the body. Choices A, C, and D describe secondary functions of the urinary system, which involves the ureters transporting urine to the bladder, the bladder serving as a reservoir for urine, and the urethra conveying urine outside the body, respectively.

The Primary Functions of the Kidneys