For osmolarity of body fluids (each compartment is broken into its section) 
• Extracellular fluid: ___% due to ________ ions 
• Intracellular fluid: ___% _____ ions 
a) 90% sodium, 10% potassium; 60% potassium, 40% sodium. 
b) 90% potassium, 10% sodium; 60% sodium, 40% potassium. 
c) 60% sodium, 40% potassium; 90% potassium, 10% sodium. 
d) 60% potassium, 40% sodium; 90% sodium, 10% potassium.