A person with increased intracranial pressure is given the diuretic mannitol to decrease the pressure. What effect will mannitol have on kidney function?

A. Completely stop urine output
B. Increase urine output
C. Decrease urine output
D. Decrease dilution of solute in the urine filtrate

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In order to determine the effect that mannitol will have on kidney function, we need to understand its mechanism of action.

Mannitol is a diuretic substance that works by increasing the osmolarity of the filtrate in the kidneys. It is not reabsorbed by the renal tubules and remains in the tubular fluid, creating an osmotic force that inhibits the reabsorption of water.

This increased osmolarity in the renal tubules leads to the movement of water from the surrounding tissues into the tubules, resulting in increased urine output. Therefore, it will have an effect on kidney function by increasing urine output.

So, the correct answer to the question is B. Increase urine output.