Diffusion

Front

What is diffusion?

Back

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.

Front

Define 'high concentration'.

Back

An area with a LARGE number of particles.

Front

Define 'low concentration'.

Back

An area with a SMALL number of particles.

Front

What is passive transport?

Back

Passive transport is the movement of particles across a membrane from an area of high concentration to an area of low concentration.

Front

What are the two types of passive transport?

Back

Diffusion and Facilitated Diffusion.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels to help move molecules across the membrane.

Front

What is the main driving force behind diffusion?

Back

The concentration gradient, which is the difference in concentration between two areas.

Front

What happens to molecules during diffusion?

Back

Molecules move randomly and spread out from areas of high concentration to areas of low concentration.

Front

Is energy required for diffusion?

Back

No, diffusion is a passive process and does not require energy.

Front

What is the role of the cell membrane in diffusion?

Back

The cell membrane selectively allows certain molecules to pass through while blocking others.