active and passive transport

Front

What is active transport?

Back

Active transport is the movement of particles across a cell membrane from an area of lower concentration to an area of higher concentration, requiring energy.

Front

What is passive transport?

Back

Passive transport is the movement of particles across a cell membrane without the use of energy, typically from an area of higher concentration to an area of lower concentration.

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration until equilibrium is reached.

Front

What is osmosis?

Back

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

Front

What is exocytosis?

Back

Exocytosis is the process by which a cell expels materials in vesicles that fuse with the cell membrane, releasing their contents outside the cell.

Front

What is endocytosis?

Back

Endocytosis is the process by which a cell takes in materials by engulfing them in a vesicle formed from the cell membrane.

Front

What role do protein pumps play in active transport?

Back

Protein pumps are specialized proteins in the cell membrane that use energy to move ions or molecules against their concentration gradient.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move molecules across the cell membrane.

Front

What is the cell membrane?

Back

The cell membrane is a protective barrier that surrounds the cell, controlling what enters and exits the cell.

Front

Why do cells need energy for active transport?

Back

Cells need energy for active transport to move substances against their concentration gradient, which is not possible through passive means.