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
Answer is C. Osmosis is the movement of water molecules across a semi-permeable membrane from a region of Lower solute concentration to an area of higher solute concentration. It is passive in nature. (REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 3)