UNI101Y1 : Ch2 Adaptations to the Physcial Environment - Water and Nutrients 1.pdf
16 Feb 2013
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Sperm whales rely on oxygen stored in hemoglobin in the blood and myoglobin in the muscles (lungs have very little oxygen) Reduce blood flow to nonvital organs (skin, viscera, lungs, kidneys, muscles) Temp. drops (apart from key organs), heart rate slows, demand for o2 drops. Weddell seal (antarctic) have thick layer of insulating fat. Slows conduction of heat from internal organs to envmt. Ad lie penguin (diving bird) insulate by trapping air in their plumage. Prob. for diving (buoyancy) enlarges waistline, increasing drag. Water pressure when diving compresses air (decreases volume, buoyancy, drag) Depth of 60 m (pressure 6 times of surface press. ) As it swims up, trapped air expands (positive buoyancy) and propels it up. Life depends on physical factors: water (basic medium of life), energy. Organisms affect physical world: soils, atmosphere, lakes, oceans, rocks gain their properties to activities of orgnms. Life exists out of equilibrium w/ the physical world.
