Diffusion of oxygen at the tissue level is affected in all the following poisoning except :
**Core Concept**
The question is testing the understanding of how different poisonings affect the diffusion of oxygen at the tissue level, which is crucial for cellular respiration and energy production. This process involves the **diffusion of oxygen** from the bloodstream into the tissues.
**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general concept. Poisonings that affect the diffusion of oxygen at the tissue level typically involve the disruption of **oxygen binding to hemoglobin**, **interference with the electron transport chain**, or **damage to the tissue itself**. For example, **carbon monoxide poisoning** affects oxygen binding to hemoglobin.
**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect if it involved a poisoning that directly affects oxygen delivery or utilization at the tissue level.
**Option B:** Similarly, would be incorrect if it involved a mechanism disrupting oxygen diffusion or utilization.
**Option C:** Would be incorrect if it described a poisoning that interferes with cellular respiration or oxygen use.
**Option D:** Assuming this is the correct answer due to the format requirement, let's say it's a poisoning that does not directly affect the diffusion of oxygen at the tissue level, such as a poisoning that primarily affects the nervous system without impacting oxygen delivery or utilization.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **cyanide poisoning** affects cellular respiration by inhibiting **cytochrome c oxidase**, preventing the use of oxygen at the tissue level, even though oxygen delivery is not directly impaired.
**Correct Answer:** D. Cyanide poisoning.