Question

why pure proteins and fats are not used in respratory substrates? i' ll feel good if i ll get the answr earliest

Answer 1

Proteins and fats have to undergo a series of chemical reactions to form simple compound and then only they can enter Krebs Cycle( it is a cycle where our cells during aerobic respiration generate energy). After forming simple compounds only then they can enter the cycle and help to produce energy which takes a lot of time. Glucose on the other hand can be easily oxidised without any complex or time consuming reactions and also it present in a quite large quantity. Due to above reasons fats and proteins are not used as respiratory substrate and glucose is used.

Hope this helps you.

Answer 2

Pure proteins and fats are never used as their forms in respiratory substrate because they can be broken down into simple compound.Example

Protein is degraded to amino acids which then enter into respiratory cycles.

Fats are broken down into fatty acids and glycerol in which fatty acids directly degraded by acetyl coA which further enter into TCA cycle...