movement of substances in and out of cells

Question 1

what is diffusion

Answer 1

movement of particles from high concentration to low concentration down a concentration gradient

Question 2

what is osmosis

Answer 2

movement of water particles from high water potential(dilute) to low water potential(concentrated) across a partially permeable membrane

Question 3

what is active transport

Answer 3

movement of molecules from their lower concentration to their higher concentration, against a concentration gradient, using energy from respiration

Question 4

factors affecting rate of movement

Answer 4

large sa to vol ratio
higher concentration gradient
shorter diffusion distance
higher temperature