Discussion
Anoxic anoxia produced by all except :
Answer: C
Anoxic anoxia is produced by all except cyanide poisoning.
Anoxic anoxia means too little oxygen reaches the blood in the lungs. Drowning (water fills the airways), being trapped in a closed almirah (the oxygen in the confined air is used up) and strangulation (the airway is compressed) all prevent oxygen from reaching the blood.
Cyanide works differently. The blood is well oxygenated, but cyanide inhibits cytochrome oxidase so the tissues cannot use the oxygen. This is histotoxic anoxia, which is why the venous blood of cyanide victims stays bright red.
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