Diffusion and Osmosis REVIEW

Front

What is the process of moving materials from an area of lower concentration to an area of higher concentration called?

Back

Active transport.

Front

What does the direction of water movement across the cell membrane depend on?

Back

The concentration of free water molecules.

Front

What is the diffusion of water through a selectively permeable membrane called?

Back

Osmosis.

Front

How does water enter the cell?

Back

By osmosis.

Front

What is the simplest type of passive transport?

Back

Diffusion.

Front

Define diffusion.

Back

The movement of molecules from an area of higher concentration to an area of lower concentration.

Front

What is passive transport?

Back

The movement of substances across a cell membrane without the use of energy.

Front

What is the role of a selectively permeable membrane?

Back

To allow certain molecules to pass while blocking others.

Front

What happens to a cell in a hypertonic solution?

Back

It loses water and may shrivel.

Front

What happens to a cell in a hypotonic solution?

Back

It gains water and may swell or burst.