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Hypertonic solution
A solution with lower water concentration than the cell contents (more concentrated). Water moves out of the cell by osmosis.
Hypotonic solution
A solution with higher water concentration than the cell contents (more dilute). Water moves into the cell by osmosis.
Isotonic solution
A solution with the same water concentration as the cell contents. No net water movement occurs.
Osmosis
The net movement of water molecules from an area of higher water concentration (dilute solution) to an area of lower water concentration (concentrated solution), across a partially permeable membrane.