Articles > Pinocytosis definition – quiz Pinocytosis definition – quiz Quiz Choose the best answer. 1. The ingestion of extracellular fluid Phagocytosis Pinocytosis Osmosis 2. Pinocytosis is a form of ______________. Exocytosis Endocytosis Osmosis 3. In pinocytosis, what happens after the cell membrane invaginates creating a pouch? The pouch bursts The pouch pinches off The cell membrane turns inside out to release the content outside 4. The function of pinocytosis To release substances outside the cell To take in water from the outside To take up nutrients from the extracellular fluid 5. A pinocytosis process A macrophage engulfs a cell A microvillus taking in nutrients An endosome fusing to the cell membrane Send Your Results (Optional) Your Name To Email Time is Up!