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23 Cards in this Set
- Front
- Back
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kidneys originate from
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intermediate mesomere
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kidney prescence is synapomorphy of
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craniata
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uriniferous tubule contains 2 parts
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nephron and collecting tube
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renal corpuscle consits of
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Bowmans capsule and glomeruli
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pronephros
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transitory developmental stage
functional in some fishes and embryos of most vertebrates |
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mesenphros/opisthonephros
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replace pronephros
functional in all vert embryos adult kidney in nonamniotes |
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metenphros
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kidney of adult amniotes
drained by ureter this is also the archinephric duct in males but degerates in females |
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opishthonephros
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the adult kidney of fish and amphibians
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hagfish do not
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osmoregulate
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lampreys and gnathostomes
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osmoregulate
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all craniates excretre
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nitrogenous waste
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first craniates are known from
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marine deposits
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uric acid and urea are
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less toxic than ammonia
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ammonotelism
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ammonia excreted as ammonia
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uricotelism
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Ammonia is excreted as uric acid
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ureotelism
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ammonia excreted as urea
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birds and insects excrete
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uric acid
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mammals, sharks, bony fish excrete
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urea
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most aquatic animals excrete
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ammonia
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first evolutionary renal function
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NH3 excretion
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given that the origin of vertebrates is from marine water
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it seems unlikely that the kidneys originated as water regulating organisms
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Henles loop
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where mammals reabsorb waste
help conserve water |
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marine bony fish are
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hypotonic to water. Water loss is a problem
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