Ryan Cell Transport When different compounds are moved across the membrane of a cell Purposes of cell transport: compounds can be taken in and released Osmosis high concentration low water concentration → simple diffusion water travels from hypotonic to hypertonic Passive Transport no energy is used more concentrated - less concentrated diffusion - down the concentration gradient the concentration gradient is potential energy Facilitated Diffusion passive diffusion with the aid of transport proteins not all substances are transported of transport proteins channel proteins carrier proteins used for charged and polar molecules Active Transport substances are transported against the concentration gradient (instead of down) low concentration to high concentration energy is gleaned when ATP is broken down ion pumps co-transport Endocytosis (Phagocytosis for solids, pinocytosis for liquids) The cell membrane encircles the particle before bringing it into the cell Exocytosis used for excessively large molecules
Ryan Cell Transport When different compounds are moved across the membrane of a cell Purposes of cell transport: compounds can be taken in and released Osmosis high concentration → low water concentration simple diffusion water travels from hypotonic to hypertonic Passive Transport no energy is used more concentrated - less concentrated diffusion - down the concentration gradient the concentration gradient is potential energy Facilitated Diffusion passive diffusion with the aid of transport proteins not all substances are transported of transport proteins channel proteins carrier proteins used for charged and polar molecules Active Transport substances are transported against the concentration gradient (instead of down) low concentration to high concentration energy is gleaned when ATP is broken down ion pumps co-transport Endocytosis (Phagocytosis for solids, pinocytosis for liquids) The cell membrane encircles the particle before bringing it into the cell Exocytosis used for excessively large molecules