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S The Phospholipid Bilayer

The Phospholipid Bilayer. Diffusion with water and Red Dye, OSMOSIS in a lettuce leaf Diffusion with water and Red Dye, OSMOSIS in a lettuce leaf

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The Phospholipid Bilayer Slide 2 Diffusion with water and Red Dye, OSMOSIS in a lettuce leaf Diffusion with water and Red Dye, OSMOSIS in a lettuce leaf The Plasma Membrane - Mahalo Professor The Plasma Membrane - Mahalo Professor Osmosis and Facilitated diffusion Osmosis and Facilitated diffusion Slide 3 CELL MEMBRANE 10. Cell Membrane SEMIPERMEABLE picky Selectively permeable Phospholipid Bilayer Hydrophobic tail Hydrophilic head Slide 4 The Cell Membrane AKA Phospholipid Bilayer, Plasma Membrane It is selectively permeable Letting only certain substances through Why? 1. If they fit between the links of the membrane 2. If a concentration gradient is there 3. If they can mix with the membrane parts. Slide 5 Slide 6 Explanation In the previous slide, I found images of different particles that either make up the membrane or need to get through it. Once I had the atoms the same size I shrunk them by the same amount so you could see what we mean when we say that a particle *wont fit* through the membrane. Slide 7 Slide 8 1. If they fit: Slide 9 Slide 10 2. If there is a Concentration Gradient: Slide 11 3. If they mix with the membrane Oil Fire advice from a victim Foreign Launguage but display of how to put out an oil fire Super hydrophobic spray water and oj Slide 12 Pearson Book Lab with animations - do together Pearson Book Lab with animations - do together Amazing Book Lab - PLEASE Print your journal answers and the table of results Amazing Book Lab - PLEASE Print your journal answers and the table of results Slide 13 The Cell Membrane AKA Phospholipid Bilayer, Plasma Membrane If a cell needs a substance in it (like food) but the particle is too big, the particle may need a doorway to help it through or the cell may need to use energy to move it. THIS IS CALLED FACILITATED DIFUSION or ACTIVE TRANSPORT Slide 14 Slide 15 Active Transport If a molecule is REALLY too big, Energy must be used to move it across the membrane. If a molecule is at a lower concentration, energy must be used to move it. http://www.youtube.com/watch?v=STzOiRqzzL4 http://www.youtube.com/watch?v=STzOiRqzzL4 http://www.youtube.com/watch?v=Kd3LorZcJew&feature =endscreen http://www.youtube.com/watch?v=Kd3LorZcJew&feature =endscreen Slide 16