Question

hello everyone !!

can anyone tell me why lipids and proteins are used as substrates in Respiration only when there is a deficiency of carbohydrates in our body ???????

plz help ❤️❤️ #

Answer 1

When carbohydrates and fats are completely used for respiration and there is an acute shortage of fuel in the cell the Proteins of protoplasm work as the respiratory substrate and this is called protoplasmic respiration. So they are may be some wasting of protoplasm when protein is used as the respiratory substrate. and these substrates yield much energy

Answer 2

hola Ritu.......here is your answer....

lipids being greater in size as compared to carbohydrates become roughly easy to be broken down.....these lipid i.e. fat particles may remain gathered in our cellular cytoplasm and may disturb the metabolism efficiency of cell organelles....so they are considered secondary substrates. .

Proteins being a composition of amino acids when act as respiratory substrates , undergo breakdown and gets converted into amine groups which react with H+ ions to form AMMONIA which is a highly toxic substance.....so they are considered as tertiary since secondary substrates I.e. lipids yield more energy i.e. 9.3 KCal per mole.....

hope u understood ^_^