metabolic reactions in the body produce
waste products
the process of removal of metabolic waste products from the body
excretion
which two excretory products are formed in much greater quantities than the rest
carbon dioxide and urea
where is urea produced
in the liver
what is urea produced from
excess amino acids
true ? false
excess amino acids can be stored in the body
false
how to make the energy stored in the amino acids in the proteins accessible
process of deamination
deamination step 1
the amino group (-NH2) of an amino acid is removed together with an extra hydrogen atom
deamination step 2
amino group and hydrogen atom combine to form ammonia
deamination step 3
remaining keto acid may enter the krebs cycle to be respired, be converted to glucose or converted to glycogen/fat for storage
properties of ammonia
very soluble
highly toxic compound
produced during deamination
what is the danger of ammonia in the body
can be very damaging if allowed to build up in the body
how is damage by ammonia avoided by the body
by converting ammonia to urea
why is urea better to have in the body than ammonia
urea is less soluble and less toxic than ammonia
how is urea formed
ammonia is combined with carbon dioxide
chemical formula for urea
2 NH3 + CO2 = CO(NH2)2 + H2O