Which statement about kidney function is accurate?

• A. They regulate breathing
• B. They remove chemicals from the blood and pass it as urine
• C. They produce bile
• D. They store vitamins

Answer: (B)

The kidneys’ job is to filter the blood and form urine. They remove waste chemicals from the blood, along with excess water and electrolytes, and excrete these as urine. This ability to clear waste from the bloodstream and regulate fluids is a central function of the kidneys, which is why the statement about removing chemicals from the blood and passing them as urine is accurate.

The other options mix up functions from other organs or aren’t primary kidney duties: regulating breathing is the job of the lungs and respiratory system, producing bile is a liver function, and storing vitamins isn’t a primary role of the kidneys.