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Excretion - Why are organic macromolecules so Why are...

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6/6/11 Why are organic macromolecules so
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6/6/11 Why are organic macromolecules so
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6/6/11 Energy-Yielding Molecules Carbohydrates Fats Proteins Describe the fate of each of these molecules following digestion.
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6/6/11 Energy-Yielding Molecules Carbohydrates Fats Proteins Describe the fate of each of these molecules following digestion.
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6/6/11 Nitrogenous Waste = Metabolic Waste
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6/6/11 Metabolic Wastes Nitrogenous Carbon dioxide Water Salts (phosphates, sulfates, etc.) Organisms must EXCRETE metabolic waste.
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6/6/11 Considering evolutionary history, organismal systems
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6/6/11 Evolution of Metabolic Wastes Important Factors § Need to conserve water § Solubility in water § Toxicity § Energy Cost
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6/6/11 Body Fluid Regulation The Excretory system is involved in regulating body fluid concentrations. How? By retaining or eliminating certain ions and water OSMOSIS: Water moves from on area of higher concentration (less solute) to an area of lower concentration (higher solute).
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6/6/11 Forms of Nitrogenous Waste
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6/6/11 Ammonia Very soluble Very toxic Found in organisms that do not need to conserve water Urea Soluble Toxic Found in organisms that conserve some water Uric Acid Not Toxic Not Soluble Found in organisms that must conserve all water some waste
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6/6/11 Considering the type of environment that the
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6/6/11 Let’s consider the excretion of nitrogenous wastes in the Paramecium
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6/6/11 Let’s consider the excretion of nitrogenous wastes in the Paramecium
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6/6/11 Which Nitrogenous Waste form is excreted by the
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6/6/11 Which Nitrogenous Waste form is excreted by the
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