Transport

By Sadia Noori

Definition Extracellular fluid- the stability of cells fluid located outside cell membranes includes,

blood plasma and interstitial fluid. Plasma membrane-a delicate bilayer of phosphide molecules enclosing the cytoplasm

in all cells. It controls the movement of substance, into and out of the cell and is responsible for recognition, adhesion and chemical communication between cells.

Diffusion- passive movement of a solute from a region of high concentration to a region of lower concentration.

Osmosis- passive diffusion of free water molecules across a semi-permeable membrane from a solution in which there are more free water molecules (a dilute solution) to a solution in which there are less free water molecules ( a more concentrated solution)

semi permeable membrane- is permeable to water and some other very small molecules, but blocks the passage of solutes such as sugars and salts.

Facilitated diffusion- passive movement across a membrane through a protein carriers, which makes the movement faster than it would be along the concentration gradient only.

Active transport- Movement of substance across membrane that requires the expenditure if energy.

Endocytosis + Exocytosis-taking external material into a cell by enclosing it in plasma membrane, which pinches off to form a vesicle within the cell, includes phagocytosis (energy of solids) and pinocytosis (entry of liquid ) Exocytosis- release of substance enclosed within a vesicles to the plasma membrane expelling the vesicle’s contents.

Pictures Extracellular fluid Plasma membrane-

Diffusion Osmosis

Osmosis Facilitated Diffusion-

Facilitated diffusion Active transport

Endocytosis + Exocytosis

Videos Extracellular fluidhttp://www.videosurf.com/video/learnursing-com-hot-shots-free-video-clips-fluid-electrolytes-95703580

Plasma membranehttp://www.youtube.com/watch?v=mtDm2OKIK1k

Diffusionhttp://www.youtube.com/watch?v=aNLU7QIbdzs&feature=related

Osmosishttp://www.youtube.com/watch?v=VVORi8Bqlss&feature=related

semi permeable membranehttp://www.youtube.com/watch?v=2Th0PuORsWY

Facilitated diffusion http://www.youtube.com/watch?v=LOJdScXKsUY

Active transporthttp://www.youtube.com/watch?v=STzOiRqzzL4

Endocytosis http://www.youtube.com/watch?v=4gLtk8Yc1Zc

Exocytosis http://www.youtube.com/watch?v=K7yku3sa4Y8