osmoreg Flashcards
(20 cards)
glomeruli in marine teleosts
- reduced in number
- primary role is to remove divalent ions
- less filtrate
glomeruli in polar teleosts
- absent
- eliminate compounds by active secretion so antifreeze proteins are not filtered out
glomeruli in freshwater teleosts
- greater in number and larger
- produce large amounts of dilute urine
PCT in freshwater teleosts
- present in three sections
- reabsorbs lots of ions
presence of loop of henle
- only present in mammals
- other organisms don’t need to concentrate urine
- reptiles produce uric acid
presence of DCT
- only absent in marine and polar teleosts
excretory products and main function of contractile vacuoles
- waste from catabolism and water
- volume regulation, elimination of water
excretory products and main function of proto and metanephridia
- ammonia
- eliminate ions and nitrogenous waste products
excretory products and main function of antennal glands
- heavy divalent ions
- Mg2+ and SO42+
- eliminate divalent ions
- gills eliminate ammonia
excretory products of malpighian tubules
- uric acid
- eliminate nitrogenous waste and conserve water
mechanism of contractile vacuoles
active transport of ions
mechanism of proto and metanephridia
- ultrafiltration and reabsorption
mechanism of antennal glands
- ultrafiltration and reabsorption
mechanism of malpighian tubules
- active secretion and reabsorption
NaCl blood levels of hagfish wrt environment
slightly higher
NaCl blood levels of elasmobranchs wrt environment
lower
1/2 seawater
replaced with urea and TMAO
NaCl blood levels of marine teleosts wrt environment
very low
1/3 seawater
solutions hagfish
kidneys used to eliminate divalent ions with water
solutions elasmobranchs
rectal glands and kidneys remove NaCl
solutions marine teleosts
gills remove NaCl
drinks seawater
kidneys eliminate divalent ions
