Obtaining and Removing Materials Lesson 1.3

A stable internal enviroment?

A flexible selectively permeable membrane that allows some substances to pass through while other cannot?

What do insects use to diffuse oxygen into their cells instead of lungs?

The diffusion of water molecules across a selectively permeable membrane?

What type of transport is facilitated difussion?

When a raisin is placed in water and soaks up the water what process is happening?

• osmosis

• diffusion

• exocytosis

• endocytosis

What type of transport is osmosis?

What are the two reason it is important for cell membrane a selective permeable?

• It lets out wastes and keeps harmful substances from entering the cell.

• Lets out the wastes and harmful substances.

• Keeps both waste and important nutrients inside the cell.

• Keeps the good nutrients in that feed the cell such as organelles and good.

What type of transport is diffusion?

What two ways does diffusion help get into the cells and the lining of your lungs to take in oxygen?

• the higher concentration of oxygen requires the use of energy.

• Oxygen is able to diffuse into the cell and requires no energy.

• The air outside the cell has a higher concentration than the cell.

• The air outside the cell has a lower concentration of then the cell.