BSCI 207 Lecture Notes - Lecture 25: Osmoregulation, Hemolymph, Osmotic Concentration
13 Jan 2016
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Document Summary
In hypotonic (saltwater) fish: bring in water and salt ions from food + seawater, actively excrete salt ions across concentration gradient from gills and kidneys. Excretion of nitrogenous wastes: ammonia, urea, uric acid, filtration, reabsorption, secretion, excretion, protonephridium = secrete excess water through numerous small kidneys, metanephridium decentralized kidney with closed circulatory systems. 10. insects have malpighian tubulues open system mush. 11. nephrons functional unit of kidney: part of the renal cortex, where the little tubules where urine is going up and down during filtration. 12. glomerulus spot where it goes from blood stream to kidneys association with. Incoming arterial blood is pressurized to push it through the tubules blood vessels still present after leaving glomerulus in loop of henle: everything blood soluble is forced into kidney tubules in first step. Job of kidneys to concentrate wastes so we don"t pee all the time and lose a ton of water and salts.
