State that water moves into and out of cells by osmosis through the cell membrane

Sourav PanNovember 14, 2024

Answered step-by-step

Water moves into and out of cells by osmosis through the cell membrane.

Mechanism of Water Movement

Cell Membrane Structure
The cell membrane is composed of a phospholipid bilayer that is selectively permeable, allowing certain molecules, including water, to pass through while restricting others. This selective permeability is crucial for maintaining the internal environment of the cell.Osmosis in Action

1. Water Movement: When there is a difference in solute concentration inside and outside the cell, water will move across the cell membrane. Water moves from an area of lower solute concentration (where there are fewer solutes) to an area of higher solute concentration (where there are more solutes).
2. Equilibrium: This movement continues until equilibrium is reached, meaning the concentration of solutes is balanced on both sides of the membrane.

Importance of Osmosis for Cells

• Turgor Pressure in Plant Cells: In plant cells, water entering the cell by osmosis creates turgor pressure, which helps maintain structural integrity and support.
• Cell Volume Regulation in Animal Cells: In animal cells, osmosis helps regulate cell volume and prevents excessive swelling or shrinking. If a cell is placed in a hypertonic solution (higher solute concentration outside), water will exit the cell, causing it to shrink. Conversely, in a hypotonic solution (lower solute concentration outside), water will enter the cell, potentially leading to swelling.