Biology-active transport,osmosis,diffusion

perpare for test

what is the GCSE definition of osmosis?

the movement of water particles through a partially permeable membrane from a region of higher water concentration to a region of lower water concentration.

what is the GCSE definition of diffusion?

the movement or particles from an area of higher concentration to an area of lower concentration moving down the concentration gradient

what is the GCSE definition of active transport?

the movement of particles from and area of lower concentration to an area of higher concentration against a concentration gradient.

why does active transport require lots of energy?

active transport require energy because particles are moving against the concentration gradient

in the small intestines why is their lots of mitochondria?

in the small intestines mitochondria transfer energy so that microvilli which sit on top of villi can use active transport so they can absorb more nutrients

Why does the microvilli and small intestines use active transport?

there is a higher concentration of nutrients such as mineral that have already been absorbed by the body however the small intestines still absorb nutrients in waste which moves against the concentration gradient therefore requires active transport.

i) in a potato cylinder practical what form of cell transport is being tested:

a. active transport

b. diffusion

c. osmosis

ii) why?

c because we are testing the movement of water particles in potato pieces