Diffusion

Question 1

What is diffusion?

Answer 1

spreading out of the particles of a gas, or any solute in a solution.

Question 2

What is the net movement of diffusion?

Answer 2

from an area of high concentration to an area of low concentration (down the concentration gradient)

Question 3

How does movement in diffusion happen?

Answer 3

Random movement (of molecules or ions) causes them to bump into eachother ─ scatter around.

Question 4

What affects the rate of diffusion? Why?

Answer 4

The greater the difference between two areas of concentration, the faster the rate of diffusion.
As temperature increases, the faster rate. particles move more quickly, so diffusion is quicker.

Question 5

How are dissolved substances moved?

Answer 5

Through diffusion, from liver cells into blood plasma.

Question 6

How is oxygen & carbon dioxide moved?

Answer 6

Oxygen ─ Through diffusion from the blood cells into cells that need blood.
Carbon dioxide ─ Through diffusion from body cells into red blood cells into air of lungs.

Question 7

Adaptations surrounding diffusion?

Answer 7

Increasing surface area ─ area over which diffusion can take place is increased, so faster rate of diffusion.