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Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

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Page 1: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Cell MembraneMaintains homeostasis by regulating the movement of molecules in

and out of the cell

Page 2: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Fluid Mosaic Model

• Polar heads are orientated to the aqueous solution (inside and outside of cell)

• Non polar tails are orientated towards one another

• Integral proteins are embedded to form a mosaic

Page 3: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell
Page 4: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Membrane Proteins

• Channel Proteins (transport)• Carrier Proteins (transport)• Receptor Proteins (signal transduction)• Cell Recognition Proteins (glycoprotein)• Enzymatic Proteins• Intercellular Joining• Attachment for Cytoskeleton

Page 5: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell
http://www.wisc-online.com/objects/index_tj.asp?objID=AP1101
Page 6: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Membrane Permeability

• Impermeable• Permeable• Differentially/Selectively Permeable

Page 7: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Terms to know

• Osmotic pressure• Turgor Pressure• Tonicity• Isotonic• Hypotonic• Hypertonic• Plasmolysis• Creanation

Page 8: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Methods of Transport Across The Cell Membrane

Passive Transport

Page 9: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell
http://highered.mcgraw-hill.com/sites/dl/free/0072421975/196646/lw02_diffusion_final.html
Page 10: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Rate of Diffusion

• Temperature increase• Increased concentration gradient• Increased membrane permeability• Smaller molecule size

Page 11: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Osmosis

• Diffusion of water through a semi permeable membrane

Page 12: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell
Page 13: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell
http://www2.nl.edu/jste/osmosis.htm
Page 14: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell
http://ccollege.hccs.edu/instru/Biology/AllStudyPages/Diffusion_Osmosis/Elodeagif.swf
Page 15: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Facilitated Transport

• Movement of molecules along the concentration gradient with the aid of carrier proteins

Page 16: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell
Page 17: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Active Transport

• Movement of molecules against the concentration gradient using carrier proteins and ATP

Page 18: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell
Page 19: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Active Transport

• Endocytosis– Phagocytosis– Pinocytosis

• Exocytosis

Page 20: Cell Membrane Maintains homeostasis by regulating the movement of molecules in and out of the cell

Animation Review

http://programs.northlandcollege.edu/biology/Biology1111/animations/transport1.html

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