Ch 44 - Chapter 44 Homeostasis Understand the difference...

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Chapter 44 – Homeostasis Understand the difference between a conformer and a regulator Understand how kidneys produce urine Understand how the countercurrent multiplier works in the vertebrate kidney 1. Understand how different regulators maintain body temperature in cold or heat Osmosis and ambient salinity 0. Osmosis= diffusion of water down concentration gradient (up solute gradient) 1. Marine organisms loose water as external salinity (about 35 ppt) is greater 2. Organisms in fresh water gain water since they are hyperosmotic Two strategies 3. Osmoconformers = internal osmolarity varies with environment 4. Osmoregulators can maintain constant salt concentrations 5. Conformers are stenohaline, regulators are euryhaline Figure on Regulators and conformers Examples of osmoregulation 0. Blue crabs or FW fish (hyper-osmoregulators) produce a dilute urine and reabsorb salts in gills 1. Marine fish produce little urine, and secrete salts from gills 2. Sharks (osmoconformers) secrete urea into their blood to become iso-osmotic with salt water Figure 44.3a Osmoregulation in a saltwater fish Figure 44.3b Osmoregulation in a freshwater fish Terrestrial osmoregulation 0. Must balance water loss with
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Ch 44 - Chapter 44 Homeostasis Understand the difference...

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