11/7/20111An animal’s regulation of body temperature helps maintain homeostasisThermoregulation: The process by which animals maintain and internal temperature within a tolerable rangeEndotherms: Birds, mammals, reptiles, some fishes, and many insectsEctotherms: Most amphibians, lizards, many fishes, and most iinvertebratesHeat is gained or lost in four ways11/7/20112Thermoregulation involves adaptations that balance heat gain and loss• Metabolic heat production• Insulation • Circulatory adaptations Countercurrent heat exchangeAnimals balance the gain and loss of water and solutes through osmoregulationPerch, a freshwater fish Cod, a saltwater fishA variety of ways to dispose of nitrogenous wastes have evolved in animals11/7/20113The urinary system plays several major roles in homeostasisOverview: The key processes of the urinary system are filtration, reabsorption, secretion, and excretionBlood filtrate is refined to urine through reabsorption and secretion11/7/20114Kidney dialysis can be a
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