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