Simple Diffusion and Cell Membrane

Front

What is diffusion?

Back

The process by which molecules move from a region of high concentration to a region of low concentration.

Front

What happens to a cell in a hypotonic solution?

Back

It will swell due to the influx of water.

Front

What happens to a cell in an isotonic solution?

Back

It will stay the same as the concentration of solutes is equal inside and outside the cell.

Front

What happens to a cell in a hypertonic solution?

Back

It will shrink as water moves out of the cell.

Front

What is the role of the cell membrane in diffusion?

Back

The cell membrane selectively allows certain molecules to pass while blocking others.

Front

What occurs when the concentration of molecules is the same on both sides of the membrane?

Back

Molecules keep moving back and forth across the membrane.

Front

What is osmosis?

Back

The diffusion of water molecules across a selectively permeable membrane.

Front

What can happen to a paramecium in fresh water?

Back

It could explode because too much water moves into the paramecium.

Front

What is a selectively permeable membrane?

Back

A membrane that allows certain substances to pass while restricting others.

Front

What is equilibrium in the context of diffusion?

Back

A state where the concentration of molecules is equal on both sides of the membrane.