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Metabolic Yield/Quotient of Respiration (Respiratory Quotient (Effected by…
Metabolic Yield/Quotient of Respiration
Citric-Acid Cycle
Each original Glucose molecule yields...
6 NADH
2 FADH
2 ATP
Anaerobic Respiration: 24 ATP net yield
Aerobic Respiration: 38 ATP net yield
Respiratory Quotient
Gas Exchange calculations
Theoretical calculation: Ideally 1.0
RQ= ratio of CO2 liberate to O2 consumed
Effected by external factors
#
Lipid metabolism
Contain virtually no O2
Often near 0.7
RQ<1.0
Acids
RQ>1.0
Oxygen rich structure= easily oxidized to produce CO2 + H2O
Production of NADH for ETC
Availability of reagents
Pentose-phosphate pathway
If ribulose-5-phosphate or erythose-4-phosphate is abstracted...
2 NADPH yield
If no abstraction
6 NADPH yield
Glycolysis
Anaerobic Glycolysis
4 ATP synthesized
2 ATP used to recapitulate glycolysis
2 ATP net yield
Aerobic Glycolysis
2 ATP produced from glycolysis
Intermediate Step:
NAD+ Pyruvate--> Acetyl-CoA +NADH
1 NADH-->2 ATP
1 Glucose--> 2 pyruvates
4-6 ATP produced per Glucose molecule
Glucose-6-phosphate= 6 ATP
Glucose=4 ATP
Fatty acid respiration
Fluctuates
Factors
Length of fatty acid chain
Abstraction of intermediates--> Lower ATP yield
Acetyl CoA entering Citric-Acid Cycle
Ideally
40% of energy in fatty acid---> ATP
No ATP produced
Thermogenic respiration
Photorespiration