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25 Cards in this Set
- Front
- Back
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excretory system |
the organs and processes which reg water level and ion conc and remove nitrogenous waste |
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excretion |
remove nitrogenous waste |
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osmoreg |
reg body fluid comp and ph by balancing uptake of water and solutes |
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osmosis |
water from low to high conc |
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passive movements of water (osmosis) cause |
imbalance in fish drinking, eating, excretion, active transport affect |
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saltwater fish osmoreg |
hypotonic to h20 |
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freshwater fish |
hypertonic to h20 |
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diadromous fish |
switch btwn fresh and saltwater at diff times in life adjust their physiology |
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anadromous fish |
hatch/born in freshwater, live in saltwater, return to freshwater to breed ie salmon, cod |
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catadromous fish |
hatch/born in salt, live in fresh, return to salt to breed ie eels, mullet, snook |
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elasmobranchs |
sharks/skates/rays reduce osmotic h20 loss by increasing blood solute conc add urea and trimethylamine oxide (tmao) to tissues |
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seabirds have nasal glands that |
reduce excess salt in blood countercurrent circ |
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salt glands in |
tear, nasal, rectal, lingual ducts |
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exoskeleton and skin, fur and feathers reduce |
water loss |
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osmoconformers are isoosmotic w/ enviro |
ie seastars, hagish |
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most animals are stenohaline |
cant tolerate fluctuations in salinity steno - narrow aline - salt |
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euryhaline animals can |
tolerate fluct in salt estuary orgs |
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excretion |
removal of nitrogenous byproducts of metabolism from cells |
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elimination |
removal of undigested food from tract |
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nitrogeneous wastes examples |
fishes - ammonia (v toxic, cant be stored) animals - urea (stored in bladder) reptiles/birds - uric acid (storage in amniotic egg) |
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Ptoonephridia |
flame bulb and tubules involved in osmoreg but not excretion ie flatworms |
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metanephridia |
osmoreg and excretion, not filtration ie annelids |
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malpighian tubules |
osmoreg and excretion, not filter ie insects |
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kidneys |
vertebrates use for osmoreg and excretion and filtration nephron 1 million |
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renal corpuscle |
=glomerulus and bowmans capsule for filtration |
