Movement of substances in & out of the cell

1 adaption in human to increase surface area to increase diffusion

villi in the small intestines increase surface area of absorption of nutrients

1 adaption in human to reduce diffusion distance

lungs have a short diffusion distance

experiment to test surface area to volume ratio on rate of diffusion

use pink agar blocks (agar with sodium hydroxide and pheno indicator.) Cut into cubes of different lengths using a scalpel. Add cubes into a beaker of 50cm hydrochloric acid and wait until its turned colourless.

What is osmosis/

water moving from an area of high conc to an area of low conc through a partially permeable membrane

Required practical ; osmosis, method

use cork borer to cut potato cylinders, use scalpel and ruler to trim to same length. measure mass of each potato and record. Put different concs of sugar solution and 1 distilled water into test tubes. leave for an hour, blot dry then record mass of each potato.

What should you apply to the evaluation?

CORMS