7. A woman weighing 72 kg is given 22mg of heavy water (D2O) intravenously. Ten minutes later a blood sample was obtained from another vein and analysis of the plasma shows 0.00007 wt % of the dye. Assume that the administered dye was evenly distributed by the end of the 10 min and that none was lost this period. What compartment does this provide information about and what is the volume