Osmosis And Diffusion And Active Transport

Front 1

diffusion

Back 1

Diffusion is the movement of a substance from a region of higher concentrationto a region of lower concentration.

Diffusion is the movement of gas or solute molecules from a region of higher concentration to a region of lower concentration until they are equal.

Front 2

osmosis

Back 2

Osmosis is the special case of diffusion involving water molecules. Water molecules move from areas of high water concentration to areas of low water concentration through a selectively permeable membrane.

Front 3

active transport

Back 3

Active transport is the process by which dissolved molecules move across a cell membrane from a lower to a higher concentration.

In active transport, particles move against the concentration gradient - and therefore require an input of energy from the cell.

Front 4

partially permeable membrane

Back 4

A partially-permeable membrane is a membrane that allows small particles such as water molecules through it, but not larger particles such as sugar molecules and ions from salts.

Front 5

when is active transport used?

Back 5

Active transport is widely used in cells. There are some situations where it is particularly important. By using active transport plants can absorb irons, even though it is against the concentration gradient. Sugar such as glucose, is always actively absurd out of your gut and kidney tubes into your blood. this is often done against a large concertino gradient.

Front 6

what is ATP responsible for?

Back 6

ATP is responsible for releasing energy for active transport to work.

Front 7

what factors can help the rate of diffusion?

Back 7

temperature and concentration

Front 8

where does diffusion occur in are body?

Back 8

in the blood stream