AS Biology. Foundation. Cell membranes and Transport1 CELL MEMBRANES and TRANSPORT.
Cell Membranes and Cell Transport Lecture. Cell Diversity.
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Transcript of Cell Membranes and Cell Transport Lecture. Cell Diversity.
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Cell Membranes and Cell Cell Membranes and Cell Transport LectureTransport Lecture
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Cell DiversityCell Diversity
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General Structure of CellsGeneral Structure of Cells
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Cell Membrane Protects the Cell Membrane Protects the CellCell
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Cell Membrane StructureCell Membrane Structure
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Phospholipid Bilayer
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Proteins in Cell MembraneProteins in Cell Membrane
These are the “windows” and These are the “windows” and “doors” of the cell.“doors” of the cell.
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Cell Membrane Controls What Enters/Leaves the Cell
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Membrane Proteins Form Membrane Proteins Form ChannelsChannels
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Membrane Proteins Act as Membrane Proteins Act as ReceptorsReceptors
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Membrane Proteins Connect Membrane Proteins Connect Cells TogetherCells Together
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Membrane Proteins Allow Membrane Proteins Allow Cells to CommunicateCells to Communicate
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Cholesterol in Cell MembraneCholesterol in Cell Membrane
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Glycoproteins and Glycolipids Glycoproteins and Glycolipids in Cell Membranein Cell Membrane
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Membrane TransportMembrane Transport
Cell membranes allow Cell membranes allow materials to enter or leave materials to enter or leave the cellthe cell
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Lumpof sugar
Diffusion
No net movement at equilibrium
Random movement leads to net movement down a concentration gradient
Water
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DiffusionDiffusion
Diffusion Animation
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DiffusionDiffusion
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Osmosis:Osmosis:Diffusion of water
across a cell membrane
Osmosis Animation
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Shriveled cells Normal cellsCells swell andeventually burst
Hyperosmoticsolution
Isosmoticsolution
Hypoosmoticsolution
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Human Red Blood Cells
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Outside
Plasmamembrane
Inside
Transport Protein
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- __Facilitated Diffusion
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Facilitated DiffusionFacilitated Diffusion
Facilitated Diffusion AnimatiFacilitated Diffusion Animationon
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A Channel Protein
H+
H+
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Carrier ProteinCarrier Protein
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Facilitated Diffusion with a Carrier Protein
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Outside of cell
Inside of cell
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Active transport
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Active TransportActive Transport
Sodium Potassium Pump Animation
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EndoctytosisEndoctytosisPhagocytosisPhagocytosisPinocytosisPinocytosisReceptor-Mediated Receptor-Mediated EndocytosisEndocytosis
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Phagocytosis
The substance engulfed is a solid particleThe substance engulfed is a solid particle
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Process of PhagocytosisProcess of PhagocytosisSubstance engulfed is a solid particle
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Pinocytosis
TheThe substance engulfed is a liquidsubstance engulfed is a liquid
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Receptor-Mediated Endocytosis
Particles join to specific receptors on the Particles join to specific receptors on the membrane causing it to indent, membrane causing it to indent, engulfing the particles in a vesicleengulfing the particles in a vesicle
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Transport of CholesterolTransport of CholesterolReceptor Mediated Receptor Mediated
EndocytosisEndocytosisPhospholipid outer layer
LDL particle
Cholesterol
Protein
Plasmamembrane
Receptorprotein
Vesicle
Cytoplasm
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ExocytosisExocytosis The reverse of endocytosisThe reverse of endocytosis During this process, the membrane of a During this process, the membrane of a
vesicle fuses with the plasma membrane vesicle fuses with the plasma membrane and its contents are released outside the and its contents are released outside the cell:cell:
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ExocytosisExocytosis