2012 How does it work? James, Ross, Halen, Josh, Lance Anatomy and Physiology 9/24/2012
Passive Transport- The movement of a chemical substance across a cell membrane without expenditureof energy by the cell, as in diffusion. (7) • Diffusion-The movement of atoms or molecules from an area of higher concentration to an area of lower concentration. Atoms and small molecules can move across a cell membrane by diffusion.(7) • Dialysis-The separation of smaller molecules from larger molecules or of dissolved substances from colloidal particles in a solution by selective diffusion through a semipermeable membrane.(7) • Osmosis-Diffusion of fluid through a semipermeable membrane from a solution with a low solute concentration to a solution with a higher solute concentration until there is an equal concentration of fluid on both sides of the membrane.(7) • Facilitated Diffusion-a process whereby a substance passes through a membrane with a aid of an intermediary or a facilitator. The facilitator is an integral membrane protein that spans the width of the membrane. The force that drives the molecule from one side of the membrane to the other is the force of diffusion. (6) • Filtration-The act or process of filtering, especially the process of passing a liquid or gas, such as air, through a filter in order to remove solid particles.(7)Citation: Houghton, Mifflin. "The Free Dictionary by Farlex." The Free Dictionary. Farlex, n.d. Web. 24Sep 2012. <http://www.thefreedictionary.com>.Active Transport- This involves the use of proteins that not only facilitate the transport of substances,but also require ATP to pump the substances in and out of the cells. Endocytosis is when the plasmamembrane extends outward and surrounds the food source while Exocytosis is the discharge of materialfrom vesicles at the cells surface.(8)Examples: The gills of marine fish have cells that can remove salt from the body by pumping it into saltwater, the uptake of glucose in the intestines, and the uptake in mineral ions in root hair cells of plants.Citation: Frank, George. "Active Transport." VBS. VBS, 01/04/2001. Web. 20 Sep 2012.<http://staff.jccc.net/pdecell/cells/activet.html>.Cell Metabolism- The chemical processes occurring within a living cell or organism that are necessary forthe maintenance of life. In metabolism some substances are broken down to yield energy for vitalprocesses while other substances, necessary for life, are synthesized.(9)Catabolism- The metabolic breakdown of complex molecules into simpler ones, often resulting in arelease of energyAnabolism- The phase of metabolism in which simple substances are synthesized into the complexmaterials of living tissue.