Movement of Substances

Movement of substances against a concentration gradient using energy.

Tiny air sacs in the lungs where gas exchange occurs.

A molecule that provides usable energy for cellular processes.

A thin boundary surrounding a cell that controls movement of substances into and out of the cell.

A process through which cells release energy from food molecules and produce ATP.

A solution containing relatively more solute.

The amount of a substance present in a particular volume.

A difference in concentration between two regions.

Folds of the inner mitochondrial membrane that increase its surface area.

Net movement of particles from higher concentration to lower concentration.