Diffusion

Question 1

What is diffusion?

Answer 1

The net movement of particles in an area of high concentration to low concentration.

Question 2

Substances transported in and out of cells by diffusion are?

Answer 2

Oxygen and Carbon dioxide in gas exchange

Question 3

Factors affecting diffusion

Answer 3

The difference in concentrations = steeper gradients speed up diffusion
The temperature = warmer temperatures provide molecules with more kinetic energy, so they spread out quicker
The surface area of the membrane = larger surface areas provide more space for diffusion to take place, so it speeds up diffusion.