Cyanide blocks Complex IV of the ETC. The likely consequence is
- Acheck_circle
Halt of ETC, halt of oxidative phosphorylation, rapid drop in cellular ATP
- B
Halt of Krebs cycle, halt of pyruvate oxidation, rapid drop in cellular CO₂ release
- C
Halt of glycolysis, halt of substrate-level phosphorylation, rapid drop in cellular NADH
- D
Boost of ETC, boost of oxidative phosphorylation, rapid rise in cellular ATP
Explanation
Without Complex IV, electrons can't be passed to O₂ — the entire ETC backs up; ATP plummets, often fatally.