Which organ filters blood to produce urine?

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Multiple Choice

Which organ filters blood to produce urine?

Explanation:
The kidneys are responsible for filtering blood and producing urine. Inside each kidney, the nephron acts as the filtration unit: blood enters the glomerulus where plasma is filtered into the tubule system. The tubules then reabsorb water and essential solutes while secreting wastes, concentrating them into urine that flows toward the bladder. This process maintains fluid and electrolyte balance and removes waste from the bloodstream. The other organs have different roles—liver detoxifies and metabolizes substances, the heart pumps blood, and the lungs exchange gases—so they don’t form urine.

The kidneys are responsible for filtering blood and producing urine. Inside each kidney, the nephron acts as the filtration unit: blood enters the glomerulus where plasma is filtered into the tubule system. The tubules then reabsorb water and essential solutes while secreting wastes, concentrating them into urine that flows toward the bladder. This process maintains fluid and electrolyte balance and removes waste from the bloodstream. The other organs have different roles—liver detoxifies and metabolizes substances, the heart pumps blood, and the lungs exchange gases—so they don’t form urine.

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