HMS, BM EQ-Bank 150

Explain how glucose is used differently as a fuel source in the glycolytic and aerobic energy systems. (4 marks)

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Sample Answer

Glycolytic System:

Breaks down glucose without oxygen in sarcoplasm
Produces 2 – 3 ATP molecules through rapid glycolysis
Results in lactic acid as by-product
Powers high-intensity exercise 10 – 60 seconds

Aerobic System:

Complete glucose breakdown with oxygen in mitochondria
Produces 36 – 38 ATP through Krebs cycle/electron transport chain
Results in CO₂ and H₂O as by-products
Powers prolonged exercise 2+ minutes

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Sample Answer

Glycolytic System:

Breaks down glucose without oxygen in sarcoplasm
Produces 2 – 3 ATP molecules through rapid glycolysis
Results in lactic acid as by-product
Powers high-intensity exercise 10 – 60 seconds

Aerobic System:

Complete glucose breakdown with oxygen in mitochondria
Produces 36 – 38 ATP through Krebs cycle/electron transport chain
Results in CO₂ and H₂O as by-products
Powers prolonged exercise 2+ minutes