alleryStart learning →Urine osmolarity runs from a low of about 50 milliosmoles up to what maximum?
A1200 milliosmoles
B300 milliosmoles
C600 milliosmoles
D2400 milliosmoles
Answer & Solution
Correct answer: A. 1200 milliosmoles
1. Urine osmolarity reflects how much water the nephrons are recovering or losing.
2. The range runs from about 50 milliosmoles when water is being dumped to 1200 milliosmoles when it is being conserved.
3. The upper figure matches the osmolarity built up deep in the medulla, which is the ceiling the duct can equilibrate with.
4. Doubling that ceiling would demand a medullary gradient the countercurrent system never generates.
_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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