Physiology Osmolality of plasma in a normal adult: September 2005, March 2012, September 2012 A 320-330 mOsm/L B 300-310 mOsm/ L C 280-290 mOsm/ L D 260-270 mOsm/ L 💡 Explanation Osmolality of plasma in a normal adult: September 2005, March 2012, September 2012 ✓ Correct Answer: C. 280-290 mOsm/ L