alleryStart learning →How does the specific gravity of urine compare with that of pure water?
AIt is always lower than that of pure water
BIt equals that of pure water at all times
CIt varies above and below that of water
DIt is always greater than that of pure water
Answer & Solution
Correct answer: D. It is always greater than that of pure water
1. Specific gravity measures the quantity of solutes per unit volume of a solution.
2. Pure water is the reference and is assigned a value of 1.0.
3. Urine always carries dissolved solutes, so its specific gravity always exceeds 1.0.
4. A value at or below that of water would mean urine with no solutes at all, which the kidney never produces.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 25 "The Urinary System", section 25.1 Physical Characteristics of Urine_
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