Comparative Test 4 (E4)

Card Set Information

Author:
mc166589
ID:
122447
Filename:
Comparative Test 4 (E4)
Updated:
2011-12-10 13:30:34
Tags:
Comparative Anatomy
Folders:

Description:
Comparative Anatomy lecture test number four.
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user mc166589 on FreezingBlue Flashcards. What would you like to do?


  1. Nitrogenous wastes from amino acid metabolism are excreted as what?
    • Ammonia
    • Urea (Uric acid)
  2. Describe ammonia and the excretion of ammonia.
    It will be excreted if there is high water turnover, because it is toxic. This form of waste is possible in aquatic environments because the water necessary to void it is availible.
  3. Describe urea (Uric acid) and the excretion of urea (Uric acid).
    Water is conserved in excretion by concentrating the waste prior to voiding, and it can be more concentrated if it is less toxic.
  4. Ancestral vertebrates probably were _____ wth their environment (marine) , but contemporary vertebrates are _____ of their enviroment.
    • Iso-osmotic
    • Ionically independent
  5. Describe the excretory system of freshwater fishes.
    • Internal salt is higher than in the environment.
    • Must eliminate excess water wntering the body by osmosis.
    • Must conserve salts.
    • Have large renal corpuscles to pass a large filtrate volume.
    • Nitrogenous waste primarily ammonia.
  6. Describe the excretory system of Marine Teleosts.
    • Internal salt lower than in the environment.
    • Must conserve water and eliminate salts.
    • Renal tubules have very small or no glomeruli.
    • Excrete excess salt through kidney tubules and through gill ionocytes (cells specialized for dealing with ions)
    • Nitrogenous waste primarily ammonia.
  7. Describe the excretory system of elasmobranchs.
    • Internal osmotic pressure close to seawater.
    • Nitrogenous wastes converted to urea.
    • Must eliminate excess water that enters body by osmosis.
    • Must eliminate excess salts that enter with food and through gills.
    • Very large renal corpuscles that pass large volumes of water.
    • Excess salts are excreted by DIGITIFORM Gland. (=rectal glands)
  8. Describe the excretory system of Amphibians.
    • Must conserve water and salts.
    • Waste converted to urea.
    • Medium-sized renal corpuscles.
    • Stay in moist habitats, some resorptions of water from urinary bladder, absorb water and salts through skin.
  9. Describe the excretory system of Reptiles.
    • Conserve water. Nitrogenous wastes converted to uric acid.
    • Water resorbed in cloaca, urinary bladder, intestine.
    • Renal corpuscles are very small.
    • Excess salt eliminated by salt excreting glands in head region.
  10. Describe the excretory system of birds.
    • Must conserve water.
    • High metabolic rates result in high levels of nitrogenous wastes.
    • Nitrogenous wastes converted to uric acid.
    • Water resorbed in cloaca and caudal end of intestine.
    • Renal corpuscles are relatively large.
    • Some species have elongated loops of henle allowing greater resorption of water.
  11. Describe the excretory system of Mammals.
    • Conserve water.
    • Nitrogenous wastes are primarily excreted as urea.
    • Produce hyperosmotic urine.
    • Renal corpuscles are relatively large.
    • Desert adapted species have a particulary long loop of Henle, which functions primarily to resorb water.

What would you like to do?

Home > Flashcards > Print Preview