What fraction of inhaled mercury vapors retained in the body?
**Core Concept**
The question tests the understanding of **mercury toxicity** and its absorption in the human body, specifically focusing on the fraction of inhaled **mercury vapors** that is retained.
**Why the Correct Answer is Right**
About 80% of inhaled mercury vapors are retained in the body. This high retention rate is due to the **lipophilic nature** of elemental mercury, which allows it to easily cross cell membranes and accumulate in tissues. The **lungs** are the primary site of absorption for inhaled mercury vapors.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it underestimates the retention rate of inhaled mercury vapors.
**Option B:** and **Option D:** are also incorrect as they do not accurately reflect the known retention rate of inhaled mercury vapors.
**Clinical Pearl / High-Yield Fact**
Mercury is a potent neurotoxin, and its accumulation in the body can lead to severe **neurological damage**. Understanding the retention rate of inhaled mercury vapors is crucial for assessing the risk of mercury exposure.
**Correct Answer:** 80%. About 80% of inhaled mercury vapors are retained in the body.