1 Flashcards
What are uricotelic animals?
Animals that excrete nitrogenous wastes as uric acid in the form of pellets or paste with minimum loss of water.
Which animals are considered uricotelic?
Reptiles, birds, land snails, and insects.
What is the primary nitrogenous waste excreted by amphibians and marine fishes?
Urea.
They are called ureotelic animals.
What is ammonia’s role in excretion?
Ammonia is produced by metabolism and is the most toxic form of nitrogenous waste.
How is ammonia excreted in aquatic animals?
By diffusion across body surfaces or through gill surfaces as ammonium ions.
What is ammonotelism?
The process of excreting ammonia.
What are the three major forms of nitrogenous wastes?
Ammonia, urea, and uric acid.
What adaptations do terrestrial animals have regarding nitrogenous waste?
They produce less toxic nitrogenous wastes like urea to conserve water.
What is the least toxic form of nitrogenous waste?
Uric acid.
What role do kidneys play in excretion?
They filter blood to remove nitrogenous wastes like urea.
What ions are involved in metabolic removal of wastes?
Sodium (Na+), potassium (K+), chloride (Cl-), phosphate, and sulfate.
