transport of a substance across a cell membrane against the concentration gradient the difference in the concentration of molecules across a distance pathological breakdown of cells by the destruction of their outer membrane The passive movement of molecules or particles along a concentration gradient, or from regions of higher to regions of lower concentration

1. active transport

transport of a substance across a cell membrane against the concentration gradient

2. concentration gradient

the difference in the concentration of molecules across a distance

3. cytolysis

pathological breakdown of cells by the destruction of their outer membrane

4. diffusion

The passive movement of molecules or particles along a concentration gradient, or from regions of higher to regions of lower concentration.

5. endocytosis

process by which a cell takes material into the cell by infolding of the cell membrane

6. equilibrium

The condition in which all acting influences are balanced or canceled by equal opposing forces, resulting in a stable system.

7. exocytosis

process by which a cell releases large amounts of material