Passive Transport

Front

What does it mean for a cell membrane to be selectively permeable?

Back

It means that the cell membrane regulates which substances can enter and exit the cell.

Front

What characteristic of a cell membrane allows it to control materials entering and leaving a cell?

Back

A cell membrane is semi-permeable.

Front

What is the role of the cell membrane in a cell?

Back

The cell membrane acts as a barrier that controls the movement of substances in and out of the cell.

Front

What happens to water molecules when the concentration outside the cell is greater than inside?

Back

Molecules of water will move INTO the cell.

Front

What process allows oxygen to pass through capillary walls?

Back

Diffusion of materials.

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy.

Front

What is an example of passive transport?

Back

Diffusion and osmosis are examples of passive transport.

Front

How does osmosis differ from diffusion?

Back

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

Front

What is the significance of the fluid mosaic model?

Back

It describes the structure of the cell membrane, highlighting that it is flexible and composed of various proteins and lipids.

Front

What role do proteins play in the cell membrane?

Back

Proteins help transport substances across the membrane and can act as receptors for signaling.