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1.4 Membrane Transport (http://en.wikipedia.org/wiki/Diffusion) Diffusion: The passive movement of particles from a region of high concentration to a region of low concentration, and no energy requires. Examples include the movement of carbon dioxide diffusing out of the blood and into the lungs. (http://bioap.wikispaces.com/Ch7+Collaboration) Facilitated Diffusion: The passive movement of particles from a region of high concentration to a region of low concentration, through a selectively permeable membrane, facilitated by carrier proteins. Example includes charged ions for example chloride ions. (http://www.goldiesroom.org/Multimedia/Bio_Images/06%20Transport/06%20Osmosis.jpg) Osmosis: The passive movement of water molecules, across a partially permeable membrane, from a region of lower solute concentration to a region of higher solute concentration. OR from a region of higher water potential to a region of low water potential. (http://facweb.bhc.edu/academics/science/robertsk/biol100/cellulartransport_files/image026.jpg) Active Transport: The movement of particles from a region of low concentration to a region of high concentration using energy in the form of ATP and against concentration gradient. Example includes the sodium potassium pump. (http://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Endocytosis_types.svg/2000px-Endocytosis_types.svg.png Endocytosis: A part of plasma membrane is pulled inward and surrounds the liquid/solid that is to be moved into the cell. The material becomes enclosed in a vesicle, which pinches off from the plasma membrane and is dawn into the cell. Example includes white blood cells taking in bacteria. (https://d2jmvrsizmvf4x.cloudfront.net/Pa7kfjhT9utJx51WAmsi_0310_Exocytosis.jpg) Exocytosis: The materials (e.g. digestive enzymes) that are made in the rough ER and transported to the Golgi to be processes. From here they are enclosed in a membrane bound vesicle and moved to the plasma membrane via microtubules. The vesicle fuses with plasma membrane and release their contents to the outside.