Cell Membrane and Passive Transport

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, relying on concentration gradients.

Front

Why is passive transport called 'passive'?

Back

It is called 'passive' because it occurs without the expenditure of energy.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels to help move substances from an area of high concentration to an area of low concentration.

Front

What is simple diffusion?

Back

Simple diffusion is the movement of molecules from an area of high concentration to an area of low concentration without the assistance of proteins.

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 the difference between facilitated diffusion and simple diffusion?

Back

Facilitated diffusion requires protein channels to assist in the movement of molecules, while simple diffusion does not.

Front

What role do protein channels play in facilitated diffusion?

Back

Protein channels provide a pathway for specific molecules to pass through the cell membrane during facilitated diffusion.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules.

Front

What happens to molecules during diffusion?

Back

During diffusion, molecules move from an area of high concentration to an area of low concentration until equilibrium is reached.

Front

Can passive transport occur against a concentration gradient?

Back

No, passive transport cannot occur against a concentration gradient; it only moves substances down their gradient.