Passive Transport

Front

What is Passive Transport?

Back

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

Front

What is Selective Permeability?

Back

The ability of the cell membrane to allow some substances to pass through while blocking others.

Front

What does a semi-permeable membrane do?

Back

It allows certain molecules to pass through while preventing others based on size and polarity.

Front

What is the direction of movement in Passive Transport?

Back

From an area of high concentration to an area of low concentration.

Front

Why can water molecules enter a cell but not sugar molecules?

Back

Because the holes in the semi-permeable membrane are too small for sugar molecules.

Front

What happens when the concentration of water is equal inside and outside a cell?

Back

There will be no net movement of water into or out of the cell.

Front

What is an example of a substance that moves via Passive Transport?

Back

Oxygen and carbon dioxide can move freely across the cell membrane.

Front

What is the role of the cell membrane?

Back

It regulates what enters and leaves the cell.

Front

What is diffusion?

Back

The process by which molecules spread from areas of high concentration to areas of low concentration.

Front

What is osmosis?

Back

The diffusion of water molecules through a semi-permeable membrane.