Chapter 8.3 Cell Transport Flashcard

Front

What is osmosis?

Back

Osmosis is the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

How does osmosis differ from diffusion?

Back

Osmosis specifically refers to the movement of water, while diffusion refers to the movement of solute molecules.

Front

What is diffusion?

Back

Diffusion is the process by which particles move from an area of higher concentration to an area of lower concentration.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain molecules to pass through while blocking others.

Front

What happens during endocytosis?

Back

During endocytosis, the cell membrane engulfs a particle, forming a pocket that eventually pinches off to create a vesicle inside the cell.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which specific molecules are transported across a cell membrane via protein channels or carriers.

Front

What role do proteins play in facilitated diffusion?

Back

Proteins act as carriers or channels to facilitate the movement of certain molecules across the cell membrane.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance between two areas.

Front

What is the significance of the concentration gradient in diffusion?

Back

Particles tend to move down their concentration gradient, from areas of higher concentration to areas of lower concentration, until equilibrium is reached.

Front

What is a vesicle?

Back

A vesicle is a small, membrane-bound sac that transports substances within a cell.