Cyanide kills an animal by

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(C) Cyanide acts as a potent metabolic poison. It binds to the iron atom in the heme group of the cytochrome $c$ oxidase enzyme (complex $IV$) in the

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Inhibiting cytochrome oxidase,a mitochondrial enzyme essential for cellular respiration by non-competitive inhibition

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(C) Cyanide acts as a potent metabolic poison. It binds to the iron atom in the heme group of the cytochrome $c$ oxidase enzyme (complex $IV$) in the mitochondrial electron transport chain. This binding is a classic example of non-competitive inhibition,which prevents the enzyme from transferring electrons to oxygen. Consequently,cellular respiration is halted,$ATP$ production ceases,and the organism dies due to the inability of cells to produce energy.

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