Which of the following statement(s) is/are true concerning the osmotic activity of body fluids?
A. Urea contributes to the osmolality of a solution but not its tonicity
B. The osmolality of the body remains fairly constant at approximately 289 mOsm/kg H2O
C. The two primary regulators of water balance are antidiuretic hormone and aldosterone
D. Serum sodium is the most valuable laboratory indicator of abnormal total body water content
Answer:A
Which of the following statement(s) is/are true concerning the osmotic activity of body fluids?
A. Urea contributes to the osmolality of a solution but not its tonicity B. The osmolality of the body remains fairly constant at approximately 289 mOsm/kg H2O C. The two primary regulators of water balance are antidiuretic hormone and aldosterone D. Serum sodium is the most valuable laboratory indicator of abnormal total body water content