Diffusion Substances move from a high to a lower concentration down a concentration gradient Carbon dioxide, oxygen, water, food substances, wastes, eg urea No Osmosis Water moves from a high to a ...

Red blood cells placed in a solution with the same water concentration as their cytoplasm (0.85 per cent salt solution) will not experience an overall change in volume. No osmosis occurs.

Merriam-Webster defines osmosis as “movement of a solvent (such as water) through a semipermeable membrane (as of a living ...

These concentration differences set up an osmotic gradient that promotes the flow of excess water from cerebral tissue to the blood via osmosis. Osmosis occurs because water moves passively along ...