Diffusion and Osmosis

Diffusion

Movement of molecules from an area of high concentration to low concentration.

Osmosis

The diffusion of water molecules through a semipermeable membrane.

Semipermeable

Allows only certain molecules to pass through.

Concentration

The amount of a substance in a certain area.

Passive Transport

Movement of substances across a membrane without using energy.

Molecules

Tiny particles that make up substances.

High Concentration

A large number of molecules in one area.

Low Concentration

A smaller number of molecules in one area.

Membrane

A thin layer that surrounds cells and controls what enters or leaves.

Equilibrium

A balanced state where molecules are spread evenly.