Download 1.4 Membrane Transport

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.