Unit 3 - Movement into and out of Cells

The net movement of particles from a region of their higher concentration to a region of their lower concentration down a concentration gradient, as a result of their random movement.

The net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution), through a partially permeable membrane.

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

Water pressure inside the cells of plants pressing outwards on the cell wall gives plant cells and tissues support.