Cell Transport Mechanisms 0.0 / 5 ? BiologyCellular processesASEdexcel Created by: Emily ReaderCreated on: 03-11-13 20:25 Diffusion Movement of particles from an area of high to low concentration across a partially permeable membrane 1 of 19 Factors affecting diffusion 1) Temperature, 2) Surface Area, 3) Distance, 4) Concentration Gradient 2 of 19 Diffusion: Passive or Active Transport? Passive - the cell uses no energy, thermal energy is supplied to the cell 3 of 19 Diffusion: Molecules involved very small, polar molecules and slightly bigger non-polar molecules 4 of 19 Osmosis The net movement of free water molecules from a low solute to a high solute concentration across a partially permeable membrane 5 of 19 Osmosis: Passive/Active? Passive - the cell uses no energy, thermal energy is supplied to the cell 6 of 19 Molecules involved Only water molecules are involved in osmosis 7 of 19 Name 4 substances inside the cytoplasm enzymes, glucose, solutes, oxygen 8 of 19 Facilitated Diffusion The random movement of particles from an area of low to high concentration 9 of 19 Molecules involved Larger polar molecules which can't normally move through the membrane 10 of 19 Channel proteins Proteins within the cell membrane with a gap between them allowing molecules to pass through 11 of 19 Facilitated Diffusion: Passive or Active? Passive - the cell uses no energy, thermal energy is supplied to the cell 12 of 19 Active Transport The movement if a molecule from a low to high concentration of that molecule using carrier proteins and ATP 13 of 19 Active Transport: Passive or Active? Active: the cell uses an internal store of energy called ATP which can be found in all cells 14 of 19 ATP Adenosine Triphosphate, consisting of three phosphate atoms bonded together, the bonds can be broken to release energy and are rebuilt using glucose 15 of 19 Carrier Proteins The molecule attaches to this protein, it changes shape and carries the molecule through it to the other side of the membrane 16 of 19 Molecules involved in Active transport Large molecules 17 of 19 The Four Mechanisms of Cell transport -Osmosis, Diffusion, Facilitated Diffusion Active Transport 18 of 19 The active transport mechanism uses what energy source? ATP - internal source found in every cell, glucose is used to repair the bonds which are broken to release energy 19 of 19
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