Cell Membrane and Transport Processes

Front

Cell Membrane (Plasma Membrane)

Back

A selectively permeable barrier that controls what enters and leaves the cell.

Front

Selectively Permeable

Back

Allows certain substances to pass while blocking others.

Front

Concentration Gradient

Back

A difference in the concentration of a substance across a space or membrane.

Front

Passive Transport

Back

Movement of molecules across a membrane without the use of energy (ATP).

Front

Diffusion

Back

Movement of molecules from high concentration to low concentration.

Front

Osmosis

Back

Diffusion of water across a selectively permeable membrane.

Front

Facilitated Diffusion

Back

Movement of molecules across the cell membrane through protein channels or carriers.

Front

Isotonic Solution

Back

A solution with the same solute concentration as the cell; water moves in and out equally.

Front

Hypotonic Solution

Back

A solution with lower solute concentration than the cell; water enters the cell, causing it to swell.

Front

Hypertonic Solution

Back

A solution with higher solute concentration than the cell; water leaves the cell, causing it to shrink.