Cell Transport

Front

What is diffusion?

Back

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules against their concentration gradient, requiring energy (ATP) to move substances from low to high concentration.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of passive transport of molecules across a cell membrane via specific transmembrane integral proteins.

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, including diffusion and osmosis.

Front

What role do protein channels play in cell transport?

Back

Protein channels facilitate the movement of specific molecules across the cell membrane, aiding in processes like facilitated diffusion.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain molecules to pass through while blocking others, maintaining the internal environment of the cell.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance between two areas, driving the movement of molecules during diffusion.

Front

What is the difference between simple diffusion and facilitated diffusion?

Back

Simple diffusion occurs directly through the membrane, while facilitated diffusion requires protein channels to help transport molecules.

Front

What is the significance of equilibrium in diffusion?

Back

Equilibrium in diffusion is reached when the concentration of molecules is equal in both areas, resulting in no net movement of molecules.