Concept #1: Osmolarity
Concept #2: Dissociation and Osmolarity
Concept #3: Hyper- vs. Hypo- vs. Isoosmotic
Concept #4: Osmosis
Concept #5: Osmotic Pressure
Concept #6: Tonicity
Concept #7: Isoosmotic But Not Isotonic
Practice: An undergraduate playing around in lab combines 1 L of pure water, 150 mmols of glucose, and 150 mmols of KCl. Assuming complete dissociation, which of the following is the osmolarity of the resulting solution?
Practice: Filtrate inside of the nephron (part of the kidney) has an osmolarity of 500 mOsM. Fluid outside of the nephron has an osmolarity of 750 mOsM. Which of the following describes the fluid inside of the nephron relative to the fluid outside of the nephron.
Practice: Filtrate inside of the nephron (part of the kidney) has an osmolarity of 500 mOsM. Fluid outside of the nephron has an osmolarity of 750 mOsM. Assume that water can move between the compartments, but solute cannot. Which compartment is hypertonic, and what is going to happen to the volume of that compartment?
Practice: The cytosol of red blood cells is approximately 300 mOsM, mostly from NaCl. You place the RBC in a extracellular solution of 600 mM sucrose. RBC membranes are not permeable to NaCl or sucrose. Circle the answer.