Physiology Which of the following transpo processes is passive? A Co-transpo of Na+ ion and a molecule into cell B Exchange of K+ ion outside the cell for Na+ ion inside the cell C Flow of H2O through cell membrane by osmosis D Uptake of molecules into cell by endocytosis 💡 Explanation Which of the following transpo processes is passive? ✓ Correct Answer: C. Flow of H2O through cell membrane by osmosis