Ch2 Adaptations to the Physcial Environment - Water and Nutrients 1.pdf

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University of Toronto St. George
University College Courses
Spencer Barrett

chapter 2 ADAPTATIONS TO WATER AND NUTRIENTS challenges for deepdiving mammalshaving enough oxygenkeeping warmsperm whales rely on oxygen stored in hemoglobin in the blood and myoglobin in the muscles lungs have very little oxygenslows metabolismreduce blood flow to nonvital organs skin viscera lungs kidneys musclesmaintains blood to brain and hearttemp drops apart from key organs heart rate slows demand for O drops 2 Weddell seal Antarctic have thick layer of insulating fatslows conduction of heat from internal organs to envmtAdlie penguin diving bird insulate by trapping air in their plumageprob for diving buoyancyenlarges waistline increasing dragwater pressure when diving compresses air decreases volume buoyancy dragdepth of 60 m pressure 6 times of surface pressit has same density as seawateras it swims up trapped air expands positive buoyancy and propels it upbiotic and abiotic factors exist togetherlife depends on physical factors water basic medium of life energyorganisms affect physical world soils atmosphere lakes oceans rocks gain their properties to activities of orgnmslife functions within physical laws
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