Necrosis of Proximal convoluted tubules is caused by :
**Core Concept**
Necrosis of the proximal convoluted tubules (PCTs) is a type of cell death that occurs in the kidneys due to ischemia, toxins, or other forms of injury. The PCTs are highly sensitive to damage due to their high metabolic rate and reliance on oxygen and nutrients for function.
**Why the Correct Answer is Right**
The correct answer is related to the mechanisms of cell injury and death in the kidneys. The PCTs are particularly susceptible to ischemic injury due to their high energy requirements and limited collateral circulation. When the renal blood flow is compromised, the PCTs are among the first structures to suffer damage, leading to cell death and necrosis.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the context of PCT necrosis.
* **Option B:** While toxins can cause damage to the PCTs, this is not the most specific or correct answer.
* **Option C:** This option is incorrect because it does not accurately describe the cause of PCT necrosis.
**Clinical Pearl / High-Yield Fact**
In the context of renal injury, the PCTs are often the first site of damage due to ischemia or toxins. This is because the PCTs have a high metabolic rate and rely heavily on oxygen and nutrients for function, making them more susceptible to injury.
**Correct Answer:** C. Ischemia