Movement into and out of the cell

Diffusion, active transport and Osmosis

What is diffusion

Diffusion is the movement of molecules from a region of high concentration to a region of low concentration; it doesn’t take energy.

Factors that affect diffusion

Surface area, distance, temperature and concentration gradient.

Osmosis

Osmosis is the net movement of water molecules from a region of higher water potential to a region of lower water potential, through a partially permeable membrane.

Active transport

The movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration using energy from respiration.