Cells shrink in hypertonic solutions due to water exiting the cell to balance the higher salt concentration outside. This process is a result of osmosis and the movement of water based on solute concentration.
When a cell is in a hypertonic solution where the salt concentration outside the cell is higher than inside, water exits the cell, causing it to shrink. This occurs because the solute concentration is greater outside the cell, leading to osmosis pulling water out of the cell.
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