The osmolarity of human urine
A) can be four times as great as normal osmolarity of human plasma.
B) is always exactly equal to plasma osmolarity.
C) is always less than plasma osmolarity.
D) is always greater than plasma osmolarity.
E) is determined primarily by the concentration of glucose.

Question

Quizplus · Accepted Answer

The osmolarity of human urine can vary depending on the body's hydration status, but it can be up to four times greater than normal plasma osmolarity. This allows the kidneys to regulate and maintain the body's fluid and electrolyte balance. Option B, C, and E are incorrect because they state that urine osmolarity is always equal to or less than plasma osmolarity, which is not true. Additionally, glucose concentration does play a role in urine osmolarity, but it is not the primary determinant.

The Osmolarity of Human Urine