Which of the following is a function of the urinary system?

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Multiple Choice

Which of the following is a function of the urinary system?

Maintaining electrolyte balance is a primary function of the urinary system. The kidneys regulate the levels of key ions—such as sodium, potassium, chloride, calcium, and bicarbonate—in the blood by reabsorbing or excreting them as needed. This keeps plasma ion concentrations within a narrow range, which is essential for nerve signaling, muscle function, and overall fluid balance. The other options point to roles of other body systems: receiving environmental stimuli is a function of the nervous and sensory systems; removing carbon dioxide from the body is a job of the respiratory system (with the kidneys helping regulate acid-base balance rather than expelling CO2); and returning tissue fluid to the blood involves the circulatory and lymphatic systems rather than the urinary system.

Maintaining electrolyte balance is a primary function of the urinary system. The kidneys regulate the levels of key ions—such as sodium, potassium, chloride, calcium, and bicarbonate—in the blood by reabsorbing or excreting them as needed. This keeps plasma ion concentrations within a narrow range, which is essential for nerve signaling, muscle function, and overall fluid balance.

The other options point to roles of other body systems: receiving environmental stimuli is a function of the nervous and sensory systems; removing carbon dioxide from the body is a job of the respiratory system (with the kidneys helping regulate acid-base balance rather than expelling CO2); and returning tissue fluid to the blood involves the circulatory and lymphatic systems rather than the urinary system.

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