Question

Where do amino acids, lipids, carbohydrates feed into cell respiration?

Answer 1

carbohydrates enters the cell respiration through glycolysis in which glucose is converted to pyruvate, and pyruvate is converted to Acetyl CoA and enters the citric acid cycle one of the major cycle in the cell respiration process. in our body any kind of material i.e either carbohydrate,aminoacid or the lipid has to convert one of the intermediate of citric acid cycle for entering into the cell respiration. in some cases glucose polymer for example Glycogen breakdown into individual glucose-6-phosphate and enters the glycolysis.

for Amino acids each amino acid enters into cell respiration in different way. some may break down into pyruvate some into oxaloacetate and some into Alpha ketogluterate. the first step while entering is amino acids undergo deamination after that basing on the chemical properties of individual amino acid determine to what intermediate in the respiration it can be easily converted.

Lipids - fatty acids enters into cell respiration by oxidation into acetyl CoA which enters citric acid cycle. in triglycerides the glycerol is readily converted into glyceraldehyde-3-phosphate one of the intermediate of glycolysis and enters into glycolysis and from there it continues further steps. the fatty acids oxidized into Acetyl CoA through beta oxidation pathway and enters into citric acid cycle.