Osmosis

This lesson covers:

  1. What 'osmosis' is
  2. What 'water concentration' means
  3. How osmosis applies to cells

Osmosis is the n movement of water molecules across a permeable membrane, from a region of water concentration, to a region of water concentration.

et
partially
higher
lower

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Illustration showing the process of osmosis as a special form of diffusion with molecules moving through a semi-permeable membrane.

True or false? Osmosis is a special form of diffusion.

True

False

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In living organisms, the partially permeable membrane is usually the ___________

Cell membrane

Chloroplast

Nucleus

Cell wall

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Diagram showing water, oxygen, and hydrogen molecules.

Osmosis is the movement of which molecules?

Hydrogen

Water

Any molecule

Oxygen

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True or false? During osmosis, water moves against the concentration gradient. 

True

False

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What would happen to red blood cells if they were placed in pure water?

There would be no movement of water, so their size and shape would not change

They would gain water and swell

They would lose water and shrink, becoming wrinkled

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Diagram showing the direction of water movement inside and outside the cell.

Looking at the diagram above, in which direction would you expect the water to move?

Inside the cell ➔ outside the cell

Outside the cell ➔ inside the cell

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