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In a way a cell is like a miniature version of you. It requires nutrients and, in the process of breaking down the nutrients, the cell produces wastes. So there has to be a way to get nutrients in and wastes out. One particular part of the cell plays a huge role in controlling what enters and leaves the cell, so this organelle is in charge of CELLULAR TRANSPORT. TRANSPORT FOLDABLE FLUID MOSAIC MODEL FLUID ___________- because individual phospholipids and proteins can move around freely within the layer, like it’s a liquid. MOSAIC ____________because its made up of many different parts Protein Phospholipid Bilayer Animatioin from: http://www.biologycorner.com/resources/diffusion-animated.gif Molecules move FROM A LOT _______“where there’s _______” to NOT ____“where there’s _______” DIFFUSION across a space Happens anytime there is a __________ DIFFERENCE in concentration in one place compared to another Concentration gradient = ________________________ DIFFUSION across a SPACE Molecules move automatically _______ DOWN the concentration gradient _______ an from area of _______ Higher concentration ____ to an area of ________ concentration Lower • EXAMPLES Blue dye in beaker demo, Someone making popcorn/grilling out Strong perfume, Bad smell in room http://leighhouse.typepad.com/blog/images/kool_aid.jpg http://www.swapmeetdave.com/Humor/Farts.htm DIFFUSION across a space Diffusion continues until the concentration equal everywhere is ________________ in space Equilibrium = ________________________ http://lhs.lps.org/staff/sputnam/Biology/U3Cell/diffusion_1.png Molecules need to move across membranes in cells Image modiified from: http://www.accessexcellence.org/AB/GG/importProt.html Diffusion can happen across a membrane in a cell, too …as long as membrane will let the molecule pass through _________________ CELL EXAMPLE: DIFFUSION automatically moves oxygen from HIGHER concentration (in lungs) to a LOWER concentration (in blood) CO2 automatically moves from where there is a HIGHER concentration (in blood) to where there is a lower concentration (in lungs) http://www.le.ac.uk/pa/teach/va/anatomy/case2/2_2.html Fold each flap to the center Fold Here Fold Here Position your paper this way Cut on the dotted lines ONLY!!!! PASSIVE TRANSPORT (no energy) DIFFUSION OSMOSIS FACILITATED DIFFUSION PASSIVE TRANSPORT (no energy) ACTIVE TRANSPORT (energy needed) DIFFUSION PUMPS OSMOSIS ENDOCYTOSIS FACILITATED DIFFUSION EXOCYTOSIS DIFFUSION Molecules move From High concentration To Low concentration Ex. Oxygen and Carbon dioxide DIFFUSION CO2 and O2 HIGH LOW OSMOSIS When WATER moves from a high to low concentration OSMOSIS H2 O HIGH LOW FACILITATED DIFFUSION Uses transport proteins to move substances from high to low concentration • Ex. Glucose or amino acids FACILITATED DIFFUSION Glucose HIGH LOW What if cell needs to move a AGAINST the molecule _________ CONCENTRATION GRADIENT? _______________ (LOWER HIGHER) Cell example: Want to put MORE glucose into mitochondria when there is already glucose in there Image from: http://www.biologyclass.net/mitochondria.jpg PUMPS Molecules move from LOW to HIGH concentration. (against the concentration gradient) PUMPS Ions LOW HIGH ATP ENDOCYTOSIS Bulk Transport into the cell a. Pinocytosis (liquids) b. Phagocytosis (solids) EXOCYTOSIS Bulk Transport out of the cell