Movement Acrross Membranes

Question 1

Definition of diffusion

Answer 1

Particles move from a region of HIGH conc to LOW conc.
Particles diffuse down a concentration gradient.
True of gases and particles dissolved in solution.

Question 2

Examples of diffusion

Answer 2

Gut - particles move from digested food products from GUT CAVITY to BLOOD in capillary

lungs- oxygen , from alveoli air spaces to blood circulating around lungs

Question 3

Definition of osmosis

Answer 3

The movement of water from a less concentrated solution to more concentrated solution through a partially permeable membrane

Question 4

Examples of osmosis

Answer 4

Water into roots / plants making it turgid so can hold upright

Question 5

Definition of active transport

Answer 5

Is the process by which dissolved molecules move accords a cell membrane from a lower to higher concentration .
Particles move against concentration gradient and require energy.

Question 6

Examples of active transport

Answer 6

Carrier proteins pick up specific molecules, taken across concentration gradient.