Agenda 1) Warm-Up 5 min 2) Pop Warm-up check 3) Cell Membrane Video 8 min 4) Intro. to Cell Transport 10 mins 5) Cell transport table 15 mins 6) Grade Quizzes 5 min 7) Osmosis Quick ticket 5 mins phospholipids Protection & support

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Bi-layer=lipids for a “sandwich structure”  Phospholipids form a thin, flexible sheet.  Proteins “float” on sheet  SEMI PERMABLE

Active vs. Passive Transport

Passive: NO ENERGY REQUIRED  Diffusion  Facilitated Diffusion  Osmosis

Particles (which are constantly moving) move from areas of high concentration to low concentration. Diffusion does NOT require energy.

 Charged and large particles can be carried through protein channels.  Fast and specific  Move from high to low

Diffusion of water through a selectively permeable membrane. When the particles are too big to fit through the membrane, water moves from high to low.

Sometimes, cells must move materials from low to high – against a concentration gradient. Active transport requires energy (ATP).

How big bulk materials get transported Endocytosis – materials taken in by cell membrane pockets Exocytosis – materials leaving the cell in membrane pockets

What did you learn about cell membranes? What is the difference between active vs. passive transport? What would happen if there was no transport systems?

DUE TODAY: Cell membrane transport table Osmosis quick ticket DUE NEXT CLASS: “The whole secret of life is to be interested in one thing profoundly and in a thousand things well.” Horace Walpole

Materials: 1.Compound microscope 2.Clean slides 3.Cover slips 4.Methylene blue 5.Iodine 6.Popsicle sticks 7.Onion 8.“e” piece

1.Cell 2.Cell theory 3.nucleus 4.Eukaryote 5.Prokaryote 6.Organelle 7.Cytoplasm 8.Cytoskeleton 9.Lipid bilayer 10.Cell membrane