Taller 8. Balance hídrico (cap 52) 1. RECAP 52.1: Excretory systems control water and salt balance and the excretion of nitrogenous waste products through three mechanisms: filtration of body fluids to form urine, active secretion of substances into the...
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Taller 8. Balance hídrico (cap 52) 1. RECAP 52.1: Excretory systems control water and salt balance and the excretion of nitrogenous waste products through three mechanisms: filtration of body fluids to form urine, active secretion of substances into the urine, and active reabsorption of substances from the urine. 1. Describe the two mechanisms used to move water across membranes. See p. 1093 2. What different salt and water balance problems might animals encounter in marine, freshwater, and terrestrial environments? What are some of the ways they meet those challenges? See pp. 1093–1094 and Figures 52.1 and 52.2 2. RECAP 52.2: Ammonia is a common metabolic waste product of nitrogen- containing molecules. Most aquatic animals excrete ammonia by diffusion into the water. Terrestrial animals and some aquatic animals detoxify it by conversion to urea or uric acid. 1. Why might you expect a species from an arid habitat to use uric acid as its primary nitrogenous waste product? See p. 1095 a
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