Biology Questions and Answers
- What is the nitrogen waste
in amphibian larvae and in the
adult animal?
Since amphibian larvaexcrete ammonia. The terrestriale are aquatic they adult
excretes urea.
- Why is the uricotelic
excretion essential for avian
and reptile embryos?
In reptiles and birds the excretorysystem is uricotelic since uric acid is (^)
insoluble, less toxic and suitable to be
stored within embryos develop.the eggs where their
- How do embryos of
placental mammals excrete
nitrogen wastes?
Placental animals, incluexcrete urea. In the adult placentalding embryos,
mammal urea is excreted through the
urine. In embryos tto the mother’s blood through thehe molecule passes
placenta and it is excreted in the
mother’s urine.
- What is the main nitrogen
waste of humans?
Human beings excrete eliminated with the urine.mainly urea
- How is urea formed in the
human body?
Urea is a product of the degradation of
amino acids. Inlose their amine the process amino group which is thenacids
transformed into ammonia. In the liver
ammonia reactsform urea and water, a p with carborocess calledn dioxide to
ureogenesis.
In the intermureogenesis a molediary recule oeactionsf ornithine is of the (^)
consumethis reason ud and another is produced. Forreogenesis is also known
as the ornithine cycle.
- Which are the organs of
the excretory system?
The excretory system is formed of
kidneys (two), and urethra. ureters (two), bladder - What are the vessels that
carry blood to the kidneys? Is
this blood arterial or venous?
The arterial vessels that carry blbe filtrated by the kidneys are the renalood to (^)
arteries. The renal artramifications of the aorta aneries ared so th (^) e
blood filtered by the kidneys is arterial
(oxygen-rich) blood.
- Which are the vessels that
drain filtered blood from the
kidneys?
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