The process of keeping the internal conditions in an organism stable

Dissolved particles

Processes such as endocytosis and exocytosis that require some of the cell's energy

The membrane that surrounds the contents of a cell and allows only certain things into and out of the cell

The movement of molecules from an area of high concentration to an area of lower concentration

Having a higher solute concentration outside of the cell and causing the cell to shrink

A property of cell membranes that allows only certain things to cross but not others

The difference in the concentration of ions or other dissolved particles between two regions

The diffusion of molecules across a membrane through special proteins in the membrane

A process used by a cell to take in a large particle

Having a higher solute concentration inside of the cell and causing the cell to swell

The state of having equal concentrations

The movement of materials into and out of cells

The process used by a cell to release materials out of the cell

The process that requires energy to move a substance from an area of lower concentration to higher concentration

The movement of water across a membrane

The two layers of phospholipid molecules arranged tail to tail that help make up cell membranes

Having equal solute concentrations inside and outside of the cell

Processes such as osmosis and diffusion that do not require energy from the cell