Movement of Substances into and out of Cells

Question 1

What is diffusion?

Answer 1

Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration

Question 2

How are cell membranes adapted for diffusion?

Answer 2

They are semi-permeable

Question 3

What is osmosis?

Answer 3

The net movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration

Question 4

What is active transport?

Answer 4

The net movement of particles against a concentration gradient from an area of low concentration to an area of high concentration using energy released during respiration

Question 5

What 4 factors affect the movement of substances?

Answer 5

1) Surface area : volume ratio
2) Distance
3) Temperature
4) Concentration gradient