Respiration

Question 1

Explain why breathing is faster and deeper during anaerobic respiration [3]

Answer 1

1. Lactate accumulates
2. Breathing was faster to take up more oxygen
   »> re-oxidise lactate to pyruvate

Question 2

Explain how electron carrier inhibitor:

• increases lactate production
• decreases O2 consumption

Answer 2

1. Electron carriers cannot pass electrons to O2
2. Electron carriers remain reduced
   » prevents the flow of electrons down ETC
3. NADH and FADH2 cannot pass electrons to ETC
   » prevents the regeneration of NAD+ and FAD
4. LDH reduces pyruvate to lactate
   » to re-oxidise NADH to NAD+
   » for glycolysis to continue