Topic 2 - lipid bilayer (lec 3)

There has been adaptation to the level of the

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Unformatted text preview: environment that they live in. BIO 1140 – SLIDE 17 > You can also find changes in membrane fluidity due to deit. These birds spend their summer in the high artic, and spends its winters in south america. The impressive thing is how it gets from the artic to south america. It first goes to the Bay of Fundy it spend two weeks in the Bay of Fundy and than it fly's over the atlantic ocean for three days non-stop. The intresting thing is that before they take this three day journey, they spend two weeks at the Bay of Fundy. What they are doing at the Bay of Fundy is eating mudshrimps, and they are very rich in unsaturated fatty acids, specifically Polly Unsaturated Fatty Acids (PUFA). PUFA's are fatty acids that have more than one double bond. The fuel for the birds is fatty acids, the value of eating mudshrimp was to adjust the composition of the muscle membrane, to make it easier to get fatty acids into them. By adding unsaturated fatty acids to membrane, making them more fluid, it will make it easier for the fatty acids to get into the muscles during exercise. Dietary adjustments of fluidity: Semi-palmated sandpiper Migratory flight from summer to winter habitat includes 2-week stopover at Bay of Fundy prior to transoceanic journey Birds feed on mudshrimp that is very high in PUFA PUFA-rich diet increases PUFA in membranes Improves fatty acid mobilization for flight endurance BIO 1140 – SLIDE 18 www.compphys.uottawa.ca Weber 2009 (JEB 212, 593-597) Dietary adjustments of fluidity: Semi-palmated sandpiper Migratory flight from summer to winter habitat includes 2-week stopover at Bay of Fundy prior to transoceanic journey Birds feed on mudshrimp that is very high in PUFA PUFA-rich diet increases PUFA in membranes Improves fatty acid mobilization for flight endurance > The scientists looked at the amount of fat stored in the bird and they also looked at the flight muscle membrane. At there arrivel and after they left the Bay of Fundy, there was no change in there fat stored. But there was a si...
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