BIOLOGY 225 Lecture Notes - Lecture 17: Trehalose, Nitrogen Balance, Evaporation

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15 Jan 2017
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To maintain homeostasis animals need to maintain: excess of hormones and materials are excreted properly, water balance major solvent of cells and extracellular fluids. Water loss = water gain over a period of time for balance. Evaporation through skin and digestion (feces and urine production) Very little water is lost through urine for small animals compared to humans. Human skin is multilayered and dead cells on surface decreases rate of evaporation. Consuming (drinking water or eating) or metabolism. Adaptations to prevent water loss in terrestrial environment. Disaccharide trehalose protects cells by replacing water associated with membranes and proteins: ion balance & ph balance, nitrogen balance nitrogenous waste converts to ammonia that is toxic. Ammonia is removed as ammonia or urea or uric acid. These factors affect bp and heart function: ion and water balance involves epithelial transport. Tubes are involved in kidney functions lumen (center) & single layer of epithelium that faces apical and basolateral side.

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