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Download Section 3.2 – Moving Cellular Materials Selectively Permeable
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Transcript
Section 3.2 – Moving Cellular Materials Selectively Permeable Membrane – allows some things to enter and leave the cell, but not all Passive Transport – the movement of substances through the cell membrane without adding energy 3 Types of Passive Transport 1) Diffusion – movement of molecules from an area where there are many to an area where there are few 2) Osmosis – the diffusion of water through a cell membrane 3) Facilitated Diffusion – molecules pass through the cell membrane with the help of transport proteins Equilibrium – two areas have equal numbers of molecules Active Transport – when energy is needed to move molecules through a cell membrane Endocytosis – taking a substance into a cell Exocytosis – substance is released from a cell
