Histotoxic hypoxia occurs due to which cause?

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Histotoxic hypoxia happens when the body's tissues can’t use the oxygen that’s being delivered. This occurs when a toxin blocks cellular respiration inside the cells, particularly at the mitochondria, so oxidative phosphorylation can’t occur even though oxygen is present in normal amounts. Chemical poisoning or high blood alcohol fits this scenario because they can disrupt the enzymes and processes needed to extract and use oxygen at the cellular level. In contrast, hypoxia caused by low atmospheric oxygen is due to insufficient oxygen entering the body; poor blood supply causes hypoperfusion; and excess carbon monoxide mainly harms oxygen transport by forming carboxyhemoglobin, not the cells’ ability to use oxygen.