Patient Care EOPA Practice Test

Which organ filters blood and forms urine?

Liver Kidneys Spleen Pancreas

Correct Answer:

Kidneys

Explanation:

Filtering blood and forming urine is the job of the kidneys. They receive blood, filter it through tiny filtering units called nephrons to remove waste products like urea and excess substances, and concentrate what remains into urine. This process also helps regulate fluid balance, electrolyte levels, and acid-base balance, and the kidneys can influence blood pressure and produce hormones such as erythropoietin. Other organs have different roles: the liver detoxifies chemicals and makes bile; the spleen helps filter blood and fight infection; the pancreas secretes digestive enzymes and hormones. But when asked which organ handles both filtering blood and forming urine, the kidneys are the match.

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