BISC306 Study Guide - Final Guide: Basal Metabolic Rate, Proximal Tubule, Respiratory Quotient
19 Dec 2016
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Osmotic pressure: shrimp-osmoregulator; vertebrates, mussel-osmoconformer; invertebrates, hyperosmotic-humans & birds; more solute than water, hypo-osmotic-amphibians, osmotic pressure of human plasma-300 milliosmoles/liter. Fluids: extracellular & intracellular fluids-osmotic pressure of 2 compartments is almost always nearly the same. Osmotic pressure-almost the same between extracellular & intracellular: interstitial fluid-most extracellular excluding that in the plasma, intracellular compartment-where most water is found, intracellular digestion-predominates in the hydra. Fish facts: saltwater fish-produces isosmotic urine. Hypo-osmotic to water (more salt in water); gain salts and lose water. Drink water & excrete salts at the gills. Saltwater fish-drink water to balance ion concentration: freshwater fish. Fresh water teleost-urine concentration is hypo-osmotic to plasma. Hyperosmotic to water (more salt in the fish); gain water and lose salts: hagfish-plasma composition most like the water it lives in. Blood plasma whose electrolyte composition most closely resembles seawater: fish-(for given body weight) have the lowest minimum weight specific cost of transportation.
