ALTERNATIVE FUELS
FOR CELLULAR
RESPIRATION
Glucose is not the only fuel for
respiration
PROTEINS (
LAST RESORT ENERGY SOURCE)
Proteins
can be fuel if broken down
into amino acids
Amino acids transformed by liver
enzymes into 4 – 5 carbon acids that
enter Glycolysis or Krebs Cycle.
*amino group removal results in build up of
nitrogenous wastes

DIAGRAM
FATS
Fats
broken down into glycerol to become
an intermediate of glycolysis and fatty
acids that enter the Krebs cycle.
Fats create twice as much ATP per gram
than carbohydrates.
CONTROL OF RESPIRATION
If
energy demand is high → blood
glucose broken down by glycolysis

If
If blood glucose is low → stored glycogen broken down
energy demand is low → blood glucose is
stored as glycogen and then as fat