Internal Environment Regulation Focus: Lipids form membranes to MAINTAIN homeostasis.

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Presentation transcript:

Internal Environment Regulation Focus: Lipids form membranes to MAINTAIN homeostasis

Homeostasis O How do we define this? O internal conditions remain stable and relatively constant. O How do organisms maintain homeostasis? O regulate temperature O balance of pH

Cell Membrane O Two Functions: O provides a boundary from outside environment O controls what goes in and out of cell O Why is this important for homeostasis?

Polarity O Defined: separation of electrical charge due to interactions O Polarity exists for both: O Atoms within a molecule interacting O Molecules interacting with other molecules

Polar Molecules Nonpolar Molecules O electrons are NOT shared evenly O Atoms involved? O electrons are shared equally O Atoms involved?

Nonpolar molecules: Lipids O Defined: organic compounds that are insoluble in water O Ex. Fats, oils, waxes, phospholipids, and steroids O Make cell membranes

Lipid Monomers O glycerol and fatty acids O Types of fatty acids: O Unsaturated O Saturated

Lipid Monomer: Glycerol

Lipid Monomer: Fatty Acid

Dehydration Synthesis 1 glycerol + 3 fatty acids  1 triglyceride + 3 H 2 O Monomer + monomer = polymer + water

Lipid Monomer: Fatty Acid

Triglyceride

Hydrolysis Synthesis O 1 triglyceride + 3 H 2 O  1 glycerol + 3 fatty acids O Opposite of dehydration, we are reversing the process

Membrane Permeability I 2 iodine Starch molecule On bottom corner, answer following question: What is the dialysis tubing selective against? Explain your reasoning. Turn in labs now

Permeability O permeability: how porous a material is O SELECTIVE PERMEABILITY: is when a membrane only allows certain molecules to cross. Ex. the “bouncer” O Draw cell membrane on board

Passive Transport O uses the natural flow of molecules to allow them to cross the membrane. O concentration gradient below.

Diffusion O movement of molecules from an area of high concentration to an area of low concentration

Osmosis (pg ) O What determines the water’s movement? O /student_view0/chapter5/how_o smosis_works.html /student_view0/chapter5/how_o smosis_works.html

The End

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