CELL MEMBRANES AND TRANSPORT

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Presentation transcript:

CELL MEMBRANES AND TRANSPORT

HOW DO CELLS GET NUTRIENTS AND WATER? HOW DO CELLS RELEASE WASTES? Moving substances across the selectively permeable membrane Selectively permeable = allowing some substances to pass through

CELL MEBRANE Gatekeeper of the cell Fence to keep substances not needed out of the cell A fence to move in important substances into the cell CELL MEBRANE

FLUID MOSAIC MODEL OF CELL MEMBRANE Composed of proteins, carbohydrates, lipids; proteins move in the membrane; not rigid; flexible

TYPES OF MOVEMENT OF SUBSTANCES ACROSS THE MEMBRANE A. PASSIVE TRANSPORT B. ACTIVE TRANSPORT

PASSIVE TRANSPORT a. Diffusion; b. Osmosis, and = the movement of molecules across the cell membrane and does not require energy. = dependent on the permeability of the cell membrane. 3 main kinds of passive transport – a. Diffusion; b. Osmosis, and c. Facilitated Diffusion.

Facilitated diffusion http://highered.mcgraw- hill.com/sites/0072495855/student_view0/chapter2/anima tion__how_facilitated_diffusion_works.html . Osmosis http://highered.mcgraw- hill.com/sites/0072495855/student_view0/chapter2/anima tion__how_osmosis_works.html

OSMOSIS Net movement of water molecules from an area of high free water concentration ( hypotonic) to an area of less free water concentration ( hypertonic) across a membrane until the concentration of free water is equal on both sides ( isotonic). =results in increase of water level

OSMOSIS http://www.stjohn.ac.th/Department/school/bio_pix/osmosis.gif http://www.greetin.gs/phoebecell/photogallery/zz4.gif

http://www.nikitasci.com/photos/images/osmosis.gif

ACTIVE TRANSPORT Use of energy (ATP) to move substances across the membrane From lower concentration area to high concentration (= against concentration gradient) http://www.biologycorner.com/bio1/active.ht ml http://highered.mcgraw- hill.com/sites/0072495855/student_view0/ch apter2/animation/

ACTIVE TRANSPORT Sodium – potassium pump Endocytosis Exocytosis Phagocytosis

CELL MEMBRANE http://www.johnkyrk.com/cellmembrane. html http://www.teachersdomain.org/asset/tdc 02_int_membraneweb/ http://www.williamsclass.com/SeventhSci enceWork/CellsOrganization.htm CELL MEMBRANE

http://www.williamsclass.com/SeventhSci enceWork/CellsOrganization.htm More links