Movement in Cells Glossary

(process) A process that requires energy from the cell to move substances, usually against their concentration gradient.

The movement of substances across a cell membrane from a region of lower concentration to a region of higher concentration, using energy (ATP).

The difference in concentration of a substance between two regions.

The net movement of particles from an area of higher concentration to an area of lower concentration, without using energy.

A plant cell that has lost water, causing it to become soft and limp.

The overall movement of particles when more move in one direction than the other.

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

(membrane): A barrier that allows some particles, usually small ones like water, to pass through but blocks larger particles.

(process): A process that does not require energy from the cell, such as diffusion or osmosis.

A plant cell in which the cell membrane has pulled away from the cell wall because too much water has left the cell.