Diffusion, Osmosis, Active Transport

Question 1

Osmosis

Answer 1

Area of HIGH Concentration to an area of LOW Concentration

Net movement of WATER molecules across a Partially Permeable Membrane

Question 2

Partially permeable membrane

Answer 2

Membrane with very small holes in it

Only tiny molecules like water can get into it

Question 3

Net movement

Answer 3

The direction of increased solute concentration

E.G. The net movement is from high to low concentration

Question 4

Diffusion

Answer 4

Area of HIGH Concentration to an area of LOW Concentration

Moves DOWN a concentration gradient

Happens in liquids and gasses because the particles are free to move

Only very small molecules can pass through the membrane (E.G. Glucose, amino acids, water and oxygen)

Question 5

Active Transport

Answer 5

Area of LOW Concentration to an area of HIGH Concentration

Goes against the concentration gradient, moves UP

Moves particles across a membrane using energy from respiration

Allows nutrients to be taken into the blood despite the concentration gradient being the wrong way