Cell Processes 7th 15.2 Cell Transport

Cells Selective permeability – cell membrane helps select what enters and what leaves Diffusion – movement from a high concentration to a low concentration Equilibrium – molecules of one substance is equal to the molecules of another substance

Cells osmosis- diffusion of water through the cell membrane Facilitated diffusion – exchange of large particles through the cell membrane Passive Transport – movement of substances through the cell membrane without energy

Isotonic Hypertonic Hypotonic

Cells Active transport – energy is required to move substances through the cell membrane Endocytosis – cell membrane envelopes and substances enter Exocytosis – cell membrane releases contents outside