This quick reference page explains the different types of passive transport in cells.

Learn all about cell membranes in this game. Build a plasma membrane and learn about the membrane's functions. Identify the parts of a membrane, and learn how diffusion, transport, and osmosis work in cells. Includes a worksheet that can...

This technical site provides an in depth look at membrane transport by clearly explaining the processes of diffusion and osmosis. Links are provided to clarify terminology.

Choose the chapter called "Active and Passive Transport" from the table of contents for explanations, comparisons, and examples of active and passive transport. This includes an illustrative diagram.

Explains the process of facilitated diffusion which allows selective movement of materials across the cellular membrane.

This lesson introduces the process of passive transport, explaining that it is a form of transport that does not require energy, and moves molecules down their concentration gradient. It is 1 of 4 in the series titled "Passive Transport."

Provides a diagram illustrating how active transport works.

A brief but clear explanation of passive and active transport. Examples are provided to further enhance clarity of the concepts.

Understand the processes that allow substances to enter and exit a cell with this interactive online worksheet. Site discusses both diffusion and osmosis.

This lesson explains the process of facilitated diffusion, explaining that it is a passive form of transport which uses protein channels to move larger molecules down their concentration gradient. It is 3 of 9 in the series titled...

This lesson explains the process of facilitated diffusion, explaining that it is a passive form of transport which uses protein channels to move larger molecules down their concentration gradient. It is 4 of 9 in the series titled...

This lesson explains the process of facilitated diffusion, explaining that it is a passive form of transport which uses protein channels to move larger molecules down their concentration gradient. It is 5 of 9 in the series titled...

This lesson explains the process of facilitated diffusion, explaining that it is a passive form of transport which uses protein channels to move larger molecules down their concentration gradient. It is 1 of 9 in the series titled...

This lesson explains the process of diffusion. It explains how diffusion is a passive form of transport, used to move molecules down their concentration gradient. It is 2 of 8 in the series titled "Diffusion."

This lesson explains the process of diffusion. It explains how diffusion is a passive form of transport, used to move molecules down their concentration gradient. It is 4 of 8 in the series titled "Diffusion."

This lesson explains the process of diffusion. It explains how diffusion is a passive form of transport, used to move molecules down their concentration gradient. It is 1 of 8 in the series titled "Diffusion."

In this hands on site, you will find several simple, fun, cheap, and educational surface area demonstrations to use when studying cell membranes.

A video animation showing how oxygen is brought to the cells in the body. Follow the oxygen as it is taken in by the lungs as gas and then transformed into solution and carried by hemoglobin throughout the body. Also learn how oxygen...

A video showing an animation of how carbon dioxide is exchanged from tissues to the lungs. Understand how an enzyme catalyzes the diffusion and breakdown of carbon dioxide in the red blood cells and lungs to have allowed it to be...

Great activity with clear background information. Try out the lab using osmosis to calculate molecular weight.

Provides an overview of osmosis and tonicity and looks at how osmosis works, as well as the role it plays in the water balance of cells. Describes hypertonic, isotonic, and hypotonic solutions and their effect on cells.