Process of maintaining a stable environment inside a cell or an entire organism.

A measurement of how much the concentration of a substance changes across a distance.

Substances cross the cell membrane without the cell providing energy.

A substance moves through a membrane from an area of high concentration to an area of low concentration.

The diffusion of water molecules across a membrane.

Diffusion with the help of transport proteins.

Special proteins in the membrane.

A substance moves against the concentration gradient (uses energy from cells).

When this pump is in operation, sodium ions are pumped out of the cell, and potassium ions are pumped into the cell. Both ions move from areas of lower to higher concentration.

Type of transport in which very large molecules cross the cell membrane.

Type of vesicle transport that moves a substance into the cell. The plasma membrane completely covers the substance, a vesicle pinches off from the membrane, and the vesicle carries the substance into the cell.

Type of vesicle transport that moves a substance out of the cell. A vesicle containing the substance moves through the cytoplasm to the cell membrane. Then, the vesicle membrane fuses with the cell membrane, and the substance is released outside the

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