Final answer:
Water leaving the tubules of the kidney in response to hypertonic fluid is an example of osmosis.
Step-by-step explanation:
Water leaving the tubules of the kidney in response to the hypertonic fluid around the tubules is an example of osmosis. Osmosis occurs when there is an imbalance of solutes outside of the cell compared to inside the cell. In a hypertonic solution, the extracellular fluid has a higher osmolarity than the cell's cytoplasm, causing water to leave the cell.