The cause of death in cyanide poisoning is :
**Core Concept**
Cyanide poisoning is a life-threatening condition caused by the ingestion or inhalation of cyanide ions. The toxic effect of cyanide is mediated through the inhibition of cellular respiration, specifically at the level of cytochrome c oxidase in the mitochondria.
**Why the Correct Answer is Right**
Cyanide binds to the iron atom in cytochrome c oxidase, preventing the transfer of electrons and thereby inhibiting the production of ATP. This results in a rapid depletion of cellular energy stores, leading to cell death and ultimately organ failure. The brain and heart are particularly susceptible to cyanide poisoning due to their high energy demands.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the mechanism of cyanide poisoning.
**Option B:** This option is incorrect because it is not a direct result of cyanide poisoning; rather, it is a consequence of the underlying cellular damage caused by cyanide.
**Option C:** This option is incorrect because it is a symptom of cyanide poisoning, but not the underlying cause of death.
**Clinical Pearl / High-Yield Fact**
In cases of suspected cyanide poisoning, prompt administration of cyanide antidotes such as hydroxocobalamin or sodium nitrite is crucial to prevent further cellular damage and improve survival chances.
**Correct Answer: C. Cellular asphyxiation. Cellular asphyxiation occurs due to the inhibition of cytochrome c oxidase by cyanide ions.**