Diffusion

Question 1

define diffusion

Answer 1

the movement of particles from an area of high concentration to an area of low concentration

Question 2

what molecules diffuse in/out of cells

Answer 2

oxygen, carbon dioxide and urea

Question 3

how does oxygen diffuse into cells

Answer 3

oxygen concentration is higher in blood outside of cell than inside the cell, so it diffuses into cell where it is used for respiration

Question 4

how does carbon dioxide diffuse out of cells

Answer 4

respiration releases carbon dioxide, causing concentration inside cell to be higher than out, meaning carbon dioxide will diffuse from inside the cell to out

Question 5

how does urea diffuse out of cells

Answer 5

urea is a waste product produced inside cells, it diffuses out of the cells into the blood plasma and is excreted by the kidneys

Question 6

what factors effect the rate of diffusion

Answer 6

• concentration gradient (bigger gradient= faster diffusion)
  -temperature (higher temp= faster diffusion)
  -surface area of cell membrane (larger surface area = faster diffusion)