Q.

Cyanide poisoning causes death in seconds because -

A. It denatures enzymes of the heart/muscle
B. It breaks the electron transport chain
C. It causes Lysis of red blood cells
D. It causes cardiac arrest
Answer» D. It causes cardiac arrest
Explanation: Cyanide poisoning occurs on exposure to a com-pound that produces cyanide ions when dissolved in water. The cyanide ion halts cellular respiration by inhibiting an enzyme in the mitochondria called cytochrome c oxidase. If cyanide is inhaled it causes a coma with seizures, apnea, and cardiac arrest, with death following in a matter of seconds.
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