B1.6 - Diffusion (Finished)

Question 1

What is diffusion?

Answer 1

The spreading out of particles from an area of high concentration to an area of low concentration

Question 2

What effect does concentration gradient have on diffusion?

Answer 2

Bigger difference in concentration means faster diffusion rate

Question 3

How do cell membranes work (basic)?

Answer 3

Big molecules can’t fit through the gaps in them but small one’s can

Question 4

Why does a larger membrane surface area mean higher diffusion rate?

Answer 4

More particles can pass through at once

Question 5

Particles move about __

Answer 5

Randomly

Question 6

Why do particles spread out (diffusion)?

Answer 6

Because they keep bumping into each other so get spread out evenly

Question 7

How do you calculate net movement?

Answer 7

Particles moving in - particles moving out

Question 8

Why does temperature affect rate of diffusion?

Answer 8

Particles gain energy so they move about faster

Question 9

Give some examples of the substances that move in our bodies by diffusion?

Answer 9

Oxygen, carbon dioxide, urea

Question 10

What is one adaption for greater diffusion rate?

Answer 10

Folds in cell membrane to maximise diffusion surface area