1.4 Diffusion

Question 1

Why do molecules in liquids and gases move about randomly?

Answer 1

Because of the energy they have

Question 2

What is the definition of diffusion?

Answer 2

The spreading of the particles resulting in a net movement from a region where they are of a higher concentration to a region with a lower concentration

Question 3

What does the net movement depend on?

Answer 3

The concentration of particles on each side of the cell membrane

Question 4

What is the difference in concentration between two areas called?

Answer 4

The concentration gradient

Question 5

The larger the concentration gradient….?

Answer 5

The faster the rate of diffusion

Question 6

What is an example of diffusion in the body?

Answer 6

The diffusion of oxygen into cells from the bloodstream when the cells respire

Question 7

What is an example of diffusion in plants?

Answer 7

The diffusion of carbon dioxide into actively photosynthesising plant cells

Question 8

What is an example of diffusion in the stomach?

Answer 8

The diffusion of simple sugars and amino acids from the gut through cell membranes