Cell Membrane Transport

Front

What is osmosis?

Back

The diffusion of water molecules across a cell membrane from an area of higher water concentration to an area of lower water concentration until equilibrium is reached.

Front

What is endocytosis?

Back

A process where a cell engulfs food or other substances by infolding its cell membrane to form a vesicle that brings the material into the cytoplasm.

Front

What is simple diffusion?

Back

A passive transport process where substances move from an area of high concentration to an area of low concentration without the use of energy (ATP).

Front

What is facilitated diffusion?

Back

A process where glucose or other substances cross the cell membrane through carrier proteins that change shape to allow entry, without the need for energy.

Front

What are protein pumps?

Back

Transport proteins that require energy (ATP) to move substances across the cell membrane from an area of low concentration to an area of high concentration.

Front

What is the cell membrane?

Back

A biological membrane that separates and protects the interior of the cell from the external environment, controlling the movement of substances in and out.

Front

What is concentration gradient?

Back

The difference in concentration of a substance across a space, which drives the movement of molecules during diffusion.

Front

What is active transport?

Back

The movement of substances across a cell membrane against their concentration gradient, requiring energy (ATP).

Front

What is passive transport?

Back

The movement of substances across a cell membrane without the use of energy, following the concentration gradient.

Front

What role do carrier proteins play in facilitated diffusion?

Back

Carrier proteins bind to specific molecules and change shape to transport them across the cell membrane without using energy.