Assignment problem: 1 L of a solution containing 200 mOm saline (NaCI) and 200 mOsm urea is administered intravenously (IV) to a normally hydrated individual.
1. Is the solution hyper-, hypo-, or iso-osmotic to normal ECF and ICF? Briefly explain your reasoning.
2. Is the solution hyper-, hypo-, or iso-tonic to normal CF and ICF? Briefly explain your reasoning.
3. How will their ECF osmolality and tonicity change with the addition of 1L of this solution? Explain your reasoning.