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GCSE Biology B2 > Cells Diffusion > Flashcards

Flashcards in Cells Diffusion Deck (8):
1

Define diffusion

The net movement or spreading of particles from an area of high concentration to an area of lower concentration

2

Define net movement

net movement = particles moving in - particles moving out

3

What is the concentration gradient?

The difference between two areas of concentration

4

The bigger the difference in concentrations between two areas, ...

the steeper the concentration gradient

5

How and why does temperature affect the rate of diffusion?

Temperature makes particles move more quickly

6

Why might a cell have a large surface area?

Allows diffusion to take place more quickly

7

How might a cell increase its surface area?

Folding up membranes or tissue linings

8

What substances pass through cell membranes in an animal body?

Water, simple sugars, amino acids from protein breakdown, oxygen (into red blood cells)