11 Osmoregulation 2 Osmotic Regulation

11 Osmoregulation 2 Osmotic Regulation - Osmoregulation and...

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Osmoregulation and Excretion I. Waste Disposal II. Osmotic Regulation III. The Mammalian Kidney A. Overall Structure, Functions and Mechanisms B. The Nephron Segments C. How Urine is Concentrated D. Regulation of Kidney Function by Hormones
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Concentration of water is about 55.5M (1 mol of H 2 O = 18g). • If there’s a solute dissolved, the concentration (chemical activity) of water is lower. • Each mol of solute decreases water conc. by 1 mol. • Water diffuses from high conc. to low conc. • Osmolarity: total solute concentration of a solution • Hyperosmotic: higher [solute] • Hyposmotic: lower [solute] • Isosmotic: same [solute] hyposmotic to compartment 2 hyperosmotic to compartment 1 compartments 1 and 2 are now isosmotic Osmosis and Osmolarity membrane permeable to water, but impermeable to solutes
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Fig. 44.4 Excretion of salt ions from gills Gain of water and salt ions from food Osmotic water loss through gills and other parts of body surface Uptake of water and some ions in food
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11 Osmoregulation 2 Osmotic Regulation - Osmoregulation and...

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