Biology Questions and Answers

Biology Questions and Answers

Excretory SystemEpithelia......................................................................................................................................................................................................................................................

1. What is excretion?

Excretion in Physiology is the process of
elimination oother toxic suf metabolic wastes abstances from the body.nd

2. What are nitrogen wastes?

Nitrogen wastes are residuals derived

from thare made from che degradation emical transformationof proteins. They (^)
of the amine group of amino acid
molecules.

3. What are the three main
   types of nitrogen wastes
   excreted by living beings?

The main nitroliving beings are ammgen wastes excronia, uric acid andeted by (^)
urea. Living beings that secrete
ammonia are Creatures that secrete uknown as ammoric acid arniotelic.e
known as uricotelic. Organisms that
secrete urea are called ureotelic.

4. Why are most ammoniotelic
   beings aquatic animals?

Aquatic animals,fishes and amphibian like crustaceans,larvae, generally bony
are ammoniotelic since ammonia
diffuses more easily through

membranes and it is more water-soluble

than the other nitroAmmonia is still the most energeticallygen wastes. (^)
economical nitrogen waste to be
synthesized.

5. Why after the passage of
   animals from the aquatic to
   the terrestrial habitat does the
   abandonment of the
   ammoniotelic excretion occur?

Ammonia is a highly toxicnot diluted and quickly excr moleculeted out ofe if (^)
the body. For this reasoammoniotelic excretion was abandonedn the (^)
in terrestrial habitats because the
availabilityreduced in this m of water for dilutioedium and wastesn is (^)
cannot be excreted so promptly to texterior. he

6. Comparing toxicity and the
   need for dilution in water how
   different are the ureotelic and
   the uricotelic excretions?
   What are some examples of
   animals that present these
   respective types of excretion?

Urea is more water-solublacid (an almost insoluble substance).e than uric (^)
Urea is also mare less toxic than ammore toxic. Both honia. owever
Some invertebrates,fishes, adult amphibians an chondrichthiand mammals (^)
are ureotelic. Reptiles, birds and most
arthropods are uricotelic.
http://www.biology-questions-and-answers.com